What do I need to improve on?

You kind of flick your hands at the beginning, or at least that's what it looks like, I would recommend not doing that. And, as above, cross on bottom is definitely optimum for good lookahead, and a fast F2L.
 
You kind of flick your hands at the beginning, or at least that's what it looks like, I would recommend not doing that. And, as above, cross on bottom is definitely optimum for good lookahead, and a fast F2L.

Not necessarily. I read somewhere that Jean Pons (a top-5 3x3 solver) does cross on top.

But it's PROBABLY a good idea to do cross on bottom or left.
 
Erik does cross on top, and he held the WR, and can do sub-12 avg's.

I'd recommend minimizing your F2L move count. Your speed seemed great, but you did a ton of moves. Try getting your total F2L around 30-35 moves on avg. As far as the LL, keep practicing the algs and try getting them all sub-2 seconds.
 
It is not because some people manage to get fast with bad habbits that we need to follow them. Let's take good habbits as soon as possible and make the cross anywhere BUT on the top.
 
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