jpobs, where are you using uptilt in the sheik match up? I don't see how that move (or falco) **** sheik and since I get ***** in the match up, it'd be cool if you explained that a bit more.
obvious stuff:
replace shine with uptilt in combos at all percents above 20%. for the most part, shining sheik above 20% isnt all that useful cuz it sends her too high for you to effectively link fj/dj dairs into more shines because she's out of hitstun before she reaches the ground and can jump out, fair out etc.
uptilt on the other hand doesn't launch very high can you can get easy dair->uptilt combos. Or you can just uptilt 2-3 times in a row until they DI it correctly, then chase with dair-> more uptilts. also, uptilt just des more damage than shine so thats good.
slightly less obvious things:
sheik has 0 priority below her.
when she's above you, either by choice, force or manipulation, you can stick a uptilt in her way and it will beat whatever she is trying to do. So say you're on FD and you approach with lasers. She full/sh oos and tries to attack, just turn around and uptilt and stuff her.
or say you're on battle field and she's under a platform. you laser approach, a typical response of hers is to jump oos, waveland on the platform towards the centre of the stage (where you are lasering) and fall down with a fair or something. turn around uptilt here.
when you're being techchased, say you tech away and the sheik chases you, when you stand, try to turn around uptilt. If the sheik is slightly slow on her chase she will run right into it and get *****. If she was perfect, well you were going to get grabbed anyway. but the bonus of this is that if the sheik tried to be funny and run up to you and paused trying to bait a spotdodge or roll (cause they know they were slow), she will still get hit by the uptilt lol.
Basically, try to fit in uptilt in as many situations as possible. its specifically useful vs sheik because of combination of her poor downwards priority and relatively bad aerial maneuverability.
watch PP vs KK, and especially the losers finals set. he uses it a TON.