Can we talk about The Flash match-up? I'm having some difficulties.
Specifically, I feel as though you have to guess a LOT in this match. You will not keep a good Flash out through zoning alone. It just won't happen. If The Flash scores a knockdown on Batman(very likely), he can:
Do a neutral jump normal that can sometimes cross-up into his 5o/50.
Walk up and do his 50/50(Slide can sometimes be stuffed and parry is well...a guess).
Do a f3 that can sometimes cross up.
All of these lead to ridiculous damage, carry toward the corner, and ridiculous set-ups afterwards. When Flash is up close, your fastest strings get beat by his low starter simply because the first hit is a high and Flash's low goes underneath it.
Using trait defensively does mitigate some of this, so there's that.