Help me get sub 1 on 4x4

[steep geyser]

I obv saw a few things I can improve but I would still like to hear more opinions and tips on how to get better :)

https://www.youtube.com/watch?v=maj0CZNTz8I

recons are on pastebin, link in the description (its still 4x4 even tho it says 5x5, dont be confused lmao)

[fluid scroll]

I'll go more in depth later once I actually have a cube with me, but just be looking at your recons your 2nd center and f3e seem very inefficient (especially with rotations), what I do to prevent this during f3e is doing 3Rw moves instead of rotating to keep the already solved cross edges in blind spots

[fluid scroll]

solve 1

1. during f2c it's very useful to be able to influence your 2nd center while solving your first center, for example doing a U' before your 1st center solution gives you a solved yellow bar on top already
2. with your 1st center solution, I think it would have been best to do U2 Rw U Rw' R Uw' U' Rw' U2 Rw for 2nd center - 2nd center should be rotationless with the exception of 1 (maybe 2 in very unlucky cases) y rotation
3. the first half of l4c was great, but you could've done U2 Rw2 U Rw2 for the red bar to save a few moves, or if you noticed where the red pieces were you could also start with the blue center in front and do U2 Rw2 U' Rw' U2 Rw2 and solve both of them (this is pretty hard to see so I don't blame you for not doing it)
4. this is a pretty small optimization, but for the last cross edge, I like to put one of the wings in the top layer (with an F on this scramble) and do a slice before inserting the wing so you don't have to do a 4 or 5 move edge insertion (on this scramble it would be Uw' U R U' R' Uw F')
5. practice doing hedge and sledge regripless during edge pairing and/or use U R U' R' instead of sledge, those small time saves will add up throughout the solve
   also regarding edge pairing, after the first 3 edges are done I like to do a Dw' so the unslved slot is already in front without having to rotate, but that might just be personal preference
   not going to critique 3x3 stage as I think your 3x3 split is already pretty good and that's probably not the advice you're looking for

also I prefer the inverse of the flip alg you're using (R' F R F' R U' R') but again i think that's just personal preference

[steep geyser]

Ok I got 2 questions

1. in f2c if I would have to use Fw moves to insert would it be better to rotate? (I'm guessing rotating is obvious for Bw moves))

2. during f3e do I decide from the start which edge not to do or are L moves ok? (That's actually 1 reason for me not switching to 3Rw moves earlier lol)

ty for the tips though I'll try to use them

Also yeah I've noticed I have problems with looking ahead to the 2nd bottom center piece on half center's which causes a pause xD