I found a way to make the Peach match-up a lot easier, if anyone cares.
As you guys know, Peach's shield pressure game is no joke. When you shield, she can dair to eat your shield, crash down on it with a fair, and then do any combination of jab shenanigans and no matter how you answer it you're putting yourself in a bad position. It isn't unbeatable, but it is very annoying and you'll probably eat a big hit no matter what you do.
A lot of people I talked to about this suggested not shielding, and instead eating the dair and using SDI to escape it. This is a good idea, except you take a lot of damage using this method.
Instead, shield the dair, and release during the last hit or two of the move.
At higher percents, you don't really have to do anything, since dair doesn't legitimately combo into anything. You take very little damage and are given the opportunity to reset. You're much faster than Peach is, so escaping follow-ups is pretty easy.
At low percents, or if you want a harder punish, release your shield just before the last hit or two and start mashing up on both control sticks as fast as possible. You take a small amount of damage but land an up air, which is of course a very good thing.
The reason I think this is the best way to escape Peach's shield pressure shenanigans is because it makes them basically harmless; you take less than 4% damage each time you perform this and reset, plus no damage is really done to your shield. No more rolling and hoping she doesn't read you, no more sitting there waiting for an opening on your shield wishing you had a grab, no more "just don't shield lol."