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Hey, I just got a really lucky scramble (27 moves, even though I average 48.917 moves per scramble) in Speed FMC last week and was wondering if there was a way to do it better and if there was a way to get more sub-30 move solves. Currently, the steps I go through are similar to Petrus, except at the end:

2x2x2 block //pretty simple, just 3 edges and a corner around 3 centers
2x2x3 block //adding on another 2 edges and a corner around a fourth center
Adjacent 2x2x1 block //adding on yet another 2 edges and a third corner around a fifth center
Strategic F2L-4 insertion //solving a fourth corner and an eighth edge to make a 3x3x2 block similarly to CFOP, but inserting it strategically to
//better the edges on the OLL case
OLL //Orientation of the Last Layer
PLL //Permutation of the Last Layer
Please let me know any suggestions you might have on how I can improve.

R' U' F L D' L2 U B2 R2 D' B2 L2 F2 L2 R' D' F L' D' R' D2 L2 U2 R' U' F

Spoiler: My Solution

Solution: U2 L2 B’ U F’ L U’ F’ R’ U F’ U’ R’ F R’ F’ R U’ R’ U B’ D’ F D’ F’ D2 B

Breakdown:
U2 L2 B’ U F’ L U’ //2x2x3 Block (7/7)
F’ R’ U F’ U’ //Adjacent 2x2x1 Block (5/12)
R’ F R’ F’ R U’ R’ U //F2L (8/20)
B’ D’ F D’ F’ D2 B //LL (PLL skip!) (7/27)
27 moves (FMC PB!) + 3.39 minutes = 30.39

So if you see any improvements to that specific solution I could've made, that would be amazing. Additionally, If you know how I can do better on average (because I'm really bad at FMC overall and my best solution besides this is a 42), then please let me know. Thanks!

The two best things you can do to improve your solves are NISS and insertions. NISS is too complicated to explain in a post, look up a tutorial on YouTube. Insertions revolve around basically solving most of the pieces (usually by solving all edges after you reach a cubestate like in step three of what you laid out, leaving up to 5 corners), then solving those pieces with commutators "inserted" into the middle of the solve wherever they cancel the most moves. This also can be learned in full on YouTube

The two best things you can do to improve your solves are NISS and insertions. NISS is too complicated to explain in a post, look up a tutorial on YouTube. Insertions revolve around basically solving most of the pieces (usually by solving all edges after you reach a cubestate like in step three of what you laid out, leaving up to 5 corners), then solving those pieces with commutators "inserted" into the middle of the solve wherever they cancel the most moves. This also can be learned in full on YouTube

Here's an example of a solution that uses both NISS/insertions for your scramble and 2x2x3 start:

Spoiler: Solution using NISS/insertions

Scramble: R' U' F L D' L2 U B2 R2 D' B2 L2 F2 L2 R' D' F L' D' R' D2 L2 U2 R' U' F

U2 L2 B' U F' L U' //223 block (7/7)
(U F U' R) //F2L-1 (4/11)
(R F R2 D R D') //L3C (5/16)

Skeleton: U2 L2 B' U F' (*) L U' D R D' R2 F' R2 U F' U'

*: U R2 U' L U R2 U' L'

Final solution: U2 L2 B' U F' U R2 U' L U R2 U2 D R D' R2 F' R2 U F' U' (21)

Moves done on the inverse scramble are in parentheses, the skeleton puts all them together back on the normal scramble only with 3 corners remaining. The insertion at (*) finishes those 3 corners while cancelling some moves.

Here's an example of a solution that uses both NISS/insertions for your scramble and 2x2x3 start:

Spoiler: Solution using NISS/insertions

Scramble: R' U' F L D' L2 U B2 R2 D' B2 L2 F2 L2 R' D' F L' D' R' D2 L2 U2 R' U' F

U2 L2 B' U F' L U' //223 block (7/7)
(U F U' R) //F2L-1 (4/11)
(R F R2 D R D') //L3C (5/16)

Skeleton: U2 L2 B' U F' (*) L U' D R D' R2 F' R2 U F' U'

*: U R2 U' L U R2 U' L'

Final solution: U2 L2 B' U F' U R2 U' L U R2 U2 D R D' R2 F' R2 U F' U' (21)

Moves done on the inverse scramble are in parentheses, the skeleton puts all them together back on the normal scramble only with 3 corners remaining. The insertion at (*) finishes those 3 corners while cancelling some moves.