I want to get a Kilo S3X and I'm having trouble figuring out the sizing. I wear jeans with a 32-33 inch inseam, and from some of the bikes I've tested, 57-58 seems good. Unfortunately all the 57s are sold out, and I'm thinking about just getting a 55 and having the seat a bit higher. I really don't think I'd mind too much, it would also make getting off easier. I think a 60 is gonna be way too big. Does anyone have any advice?

Go by the top tube length. That makes a bigger difference than standover.