This is good. Also, don't use algs for everything - only the especially difficult cases that can't really be efficient without algs.There is a little bit of misconception about back slots of f2l. What you should be capable of doing is executing all your f2l algs from both front and back left and right sides(as in the alg and its mirror) . What you should do for your first pair if you can execute and pair it in the front or back without cube rotating then do so, however if you have to rotate to perform your alg then rotate to have it in the back therefore your front slots will be empty. Your goal is to simply keep as many front slots empty as possible while not ever having to do a y2 in your f2l the only allowed cube rotations for f2l are y and y' as long as you can't do your pair from your current spot(if you can do it from your position front or back then don't rotate). In doing say the 3rd pair and you find yourself in need of a rotation, turn the cube so that the forth pair's location is on the front even if that means making the 3rd pair on the front too.
I hope this helped you better understand how to do f2l pairs in the back.