At what percent can I escape Sheik's CG? Also, what is the optimal DI to get out? I thought it was DI up all the way but i seem to still be getting grabbed later than I should be.
Around 55-60ish start doing slight DI behind and slight DI forward to make Ganon go exactly straight up from the dthrow. Make it so the sheik player has trouble choosing which direction to grab. She'll miss eventually or have to try some utilt into fair ****. SDI the utilt behind unless you're near ledge and it's going to put you offstage. That way it's at least possible you'll only eat a bair. Eating a fair isn't the end of the world either. Unless you're close to ledge (you'll go offstage aka dead), it often gives you the ledge for free.
^This 100%
You can't force her to dash behind, which is why the CG is noticeably easier for her. If they're bad i'll just DI to go straight up and just *barely* either way, and they'll often mess up. If they like to combo instead of CG at that point (out of fear of whiffing grab and facing my DJ -> stomp -> CG -> kill) then I try to SDI the utilt behind then uair as I land. If they ftilt instead then they can't follow up because the away DI. They can counter this with instant dash behind FH rising uair, which is really hard and I've never had anyone actually do. Dash behind SH weak reverse bair may also beat this?
At 0%, full DI away and mix up your teching. No tech is probably the overall best choice there. Then if they jab, SDI up and DJ out. If they crouch in front of you, mix up [getup in place -> something fast] and roll in (to force her to dash behind).
At med% (like 30?) I like to do 1/2 away DI sometimes (and try to jump out). If they're good, they might actually dash grab too quickly.
How I try to escape the CG is 100% based on my opponent. 99% of people who learn and practice "optimal" stuff like this ALWAYS [try to] DO IT THE SAME WAY. So find the one thing that makes it really hard for them.
Practice the sheik CG against ganon in 20XX. Figure out what should make it hard for them, and when, and why.