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I tried since start and got same result different path:

Spoiler

S: R' U' F L2 R2 F2 D2 F2 D2 L2 U R B' L2 R' F2 D2 R B2 D' L U' R' U' F
(L F' L2 U2 F) // 222 (5)
B R D R2 //223 (4)
D B2 D L' D2 L D2 L' D' L // F2L-1 (10)
R D' R' // L4C (3)

Skeleton:
B + R D R2
D B2
D L' D2 L D2 L' D' L
R / D' R'
F' U2 L2 F L'

Insert at:
/ R U R' D' R U' R' D (Cancels 4) (8-4)
+ B' D B U B' D' B U' (Cancels 2) (8-2)

Final Solution (32):
D B U B' D' B U' R D R2 D B2 D L' D2 L D2 L' D' L R2 U R' D' R U' R2 F' U2 L2 F L'

It's funny to do the final solution without step by step and NISS

26.33 mo3 over 3 daily Reddit scrambles, all without insertions.

1) 26
Scramble: L D' B2 U2 F' U' B U R B R2 F U L' U' F2 D' F2 R2 B

Spoiler

R F' B' U R2 U//6 move 2x2x3 woah (6/6)
R D' L2 D R'//Pseudo F2L-1 (5/11)
B' L B L B' L B//pseudo F2L (7/18)
F' L' F L' F' L2 F D2//LL+correction (8/26)

2) 26
Scramble: L' D L2 F' R U L' B2 R' D2 F L U B' L' D2 R' D' F' L'

Spoiler

(R' U R2 D B D')//2 squares (6/6)
(F2 U2 F)//2x2x2 (3/9)
(R2 B' R D')//blocks (4/13)
(R' B D2 B' R')//F2L-1 (5/18)
(D' B2 D B' L B L' B)//LL skip (8/26)

3) 27
Scramble: U2 L2 B U' R2 F U2 R F' R B L D' B' D' B' D2 F2 D2 L2

Spoiler

B D2 B' R B2 R2 F'//2x2x3 (7/7)
U' L2 U2 L B2 L' U' B//initially wanted to EO but made an F2L-1 (8/15)
L2 B D' B' D//F2L (5/20)
D L D' L D L2 D' L//LL (8-1/28-1)

I've just started experimenting with FMC, this is typically how my FMC solves go, and I end with two twisted corners:

Scramble: B R F2 D' L' U F' B U' D' R D F R U' R2 D2 L' U' R' B2 F U L' R

Solution:
1x2x2: L D R2 B'
2x2x2: U B2 U'
3x2x2: B' L' B' R F' R' B2
EO: D' L' D
Triple-X Cross: L' D F2 D'
Final Edges: U L' U' L U L2 U' L2
Top Corners: F2 L2 F' R' F L2 F' R F'
Final Corner Pair Twist: L' U' L U L' U' L D L' U L U' L' U L D'

It seems like things start to fall apart after the edge orientation step. I understand the basics of commutators and conjugates, but I'm unsure of how I would find where to insert them in this solution? Where am I going wrong, and what can I do to improve my thinking/approach?

I'm not the best at FMC, but in my opinion the place this solve goes wrong is as soon as you have 5 corners, two of which are twisted. There's no easy way to solve those twisted corners efficiently. Even if you just added a bunch of moves to get your final edges much less efficiently (such as U L2 U' L U L' U' L ' U L2 U' L' - 5 moves worse) would give you 5 corners all mispermuted, and you should be able to find simple insertions that would solve those much faster than your solution above. But that would still result in a really high move count; I'd say you probably mainly just need to look for a better start.

Which is the Scramble?
(Nvm somehow I was expecting a RUF scramble... my bad)

I just did a 26 on Berkeley weekly contest:
U2 B F D L2 R2 U B' R' U' F2 L R2 U2 D2 R' F' U L R2

Spoiler

U' * D R D F // 222 (+5/5)
B' U R2 U B' R U B' // F2L-1 (+8/13)
U B' U B2 L' B' L // L3C (+7/20)
Insert at * :
* U L U' R' U L' U' R (Cancels 2) (+6/26)

Final solution 26:
L' U' R' U L U' R D R D F B' U R2 U B' R U B' U B' U B2 L' B' L

Weekly comp. scramble (ongoing):
D2 R2 D2 B2 D2 U2 R2 U2 F D2 R' D2 B L2 R F' R' U F2

Spoiler

(F' D' R U') orient all pieces,
(L2 F2 @ D2 B2) edges swap,
(F2 L' U2 L' R' B' U2 D2 F D2 R' D2 L') all but 6 centers.

Insert at @: S M' S'
After insertion:
(F' D' R U' L2 B F D U' L' R) solved B-F centers,
Finish: (D2 L2 R2 F' U2 B2 D' F2 B2 U R2 F' R2 B')
Solution: B R2 F R2 U' B2 F2 D B2 U2 F R2 L2 D2 R' L U D' F' B' L2 U R' D F 25 moves
Solved in 75 mins

Can someone help me with this pre move issue im having?
I'd consider myself intermediate at FMC at best FYI

Scramble: L2 D2 L2 F L2 D2 F U2 F2 D2 L U B D F D U2 B' R D2 R2

X'
L R' B' L F2 D2 2X2X2
X'
U' L F L2 U' F U2 F F2L-2
B' U B F' U F F2L-1

B' U' B L U2 L' U2 L U2 L' B2 R B R2 PSEUDO L3C

I noticed that it looked like a pseudo L3C after performing the last 14 moves. So I thought I'd try to use the pre moves to see if I could look for an insertion with the cube looking like an actual L3C visually. But no matter what I do. The premoves (R F or F' R') I'm applying before the scramble don't work after I apply my skeleton.

So here's the question(s): does the pre move/pseudo block technique even work in this situation? Or am I just applying the wrong premoves?

Can someone help me with this pre move issue im having?
I'd consider myself intermediate at FMC at best FYI

Scramble: L2 D2 L2 F L2 D2 F U2 F2 D2 L U B D F D U2 B' R D2 R2

X'
L R' B' L F2 D2 2X2X2
X'
U' L F L2 U' F U2 F F2L-2
B' U B F' U F F2L-1

B' U' B L U2 L' U2 L U2 L' B2 R B R2 PSEUDO L3C

I noticed that it looked like a pseudo L3C after performing the last 14 moves. So I thought I'd try to use the pre moves to see if I could look for an insertion with the cube looking like an actual L3C visually. But no matter what I do. The premoves (R F or F' R') I'm applying before the scramble don't work after I apply my skeleton.

So here's the question(s): does the pre move/pseudo block technique even work in this situation? Or am I just applying the wrong premoves?

For 4c3e skeletons (the 4 is a twisted three cycle), whats the best order for checking for insertions? Edge corner corner, corner edge corner, or corner corner edge?

For 4c3e skeletons (the 4 is a twisted three cycle), whats the best order for checking for insertions? Edge corner corner, corner edge corner, or corner corner edge?

You'd probably be better off finding an insertion to solve the edges + leave 3 corners, such as a sexy move or a block comm. If you must use 3 insertions, I think the best approach is to check for all 3 at the same time, and see which first insertion gives the best cancellations.

I sort of meant that it was just pure blockbuilding; no NISS or premoves or fancy stuff. Pretty easy to see even if you don't know any FMC techniques. But yeah, probably should have clarified