I know a lot of this has probably already been noted, but if nothing else I thought it might be helpful to have a consolidated list. So far I have only really looked at the best options for F3 and B1 starters. I use B1 occasionally on knockdown to mix it up a bit, plus since f2-d1 scales like crazy now, its probably the best low starter. Plus ppl who know the MU will often crouch block a f2 to get ready to mash out D1's after f2-3,breath and what not.
Anyway here's the rough list. Sorry to include so many variations. I just figured certain combos would be easier for certain people so I'd include small variations even if they do the same % damage (usually just differences in gravity).
F3 Starter
Trait and Meter
F3, j2, 3~trait, 3~freeze, zap, 3~scoop, 3~breath = 61% Lower Difficulty
F3, 3~zap, 3~trait-scoop, 3~freeze, zap, 3,breath = 62%
F3, 3~trait, 11,11, 3~Freeze, zap, 3~scoop, 3~breath = 62%
F3, j3, 3~trait, 3~freeze, zap, 3..~scoop, 3~breath = 64% Medium Difficulty
F3, 3~zap, 3~trait, 111~Freeze, zap, 3~scoop, 3~trait = 67%
F3, 3~zap, 3~trait, 3~freeze, zap, 3~scoop, 3~breath = 71% Higher Difficulty
Trait and No Meter
F3, j3, 3~trait, 111~scoop, 3~breath = 46%
F3, j3, 3~trait, 3~scoop, 3~breath - 48%
F3, j3, 3~trait, 11, 111~scoop, 3~breath = 48%
F3, 3~zap, 3~trait-scoop, 3~breath = 49%
F3, 3~zap, 3~trait, 111~scoop, 3~breath = 53% pretty easy
F3, 3~zap, 3~trait, 3~scoop, 3~breath = 55% can be tricky
Meter and No Trait
F3, j3, 3~Freeze, zap, 3~scoop, 3~breath = 50% Can add 11 before 3~freeze, or before 3 freeze for same dmg but more gravity
F3, j3, 3~freeze, zap, 11, 3~scoop, 3~breath = 51%
F3, 3~zap, 3~freeze, j2, 111~scoop, 3~breath = 53%
F3, 3~zap, 3~freeze, j2, 223, 111~scoop, 3~breath = 55%
F3, 3~zap, 3~freeze, j2, 223, 3~scoop, 3~breath = 56%
F3, 3~zap, 11, 3~freeze, zap, 3~scoop, 3~breath = 57%
No Trait, No Meter
F3, j3, 11, 3~scoop, 3~breath = 39% can add an additional 11 after the first one and bring it to 40%
F3, 3~zap, 111~scoop, 3~breath = 42%
F3, 3~zap, 11, 111~scoop, 3~breath = 44%
F3, 3~zap, 3~scoop, 3~breath = 45% (harder than 46 imo)
F3, 3~zap, 11, 3~scoop, 3~breath = 46%
Instead of f2 d1, use b1 on knock downs
I haven't looked into it yet, but characters with short d1's/pokes may whiff their d1/poke after breath, while you are always in range to connect with b1. This could also be a terrible set-up, I don't know yet.
Trait/Meter
b1~freeze, zap, 11~trait, 3~scoop, 3~breath = 44%
b1~freeze, f3, 3~zap, 3~trait-scoop, 3~breath = 47%
b1~freeze, zap, 3~trait, 3~scoop, 3~breath = 50%
b1~freeze, f3, 3~zap, 3~trait, 111~scoop, 3~breath = 50%
b1~freeze, zap, 3~trait, 11, 111~scoop, 3~breath = 50%
b1~freeze, zap, 3~trait, 11, 3~scoop, 3~breath = 52%
b1~freeze, f3, 3~zap, 3~trait, 3~scoop, 3~breath = 52%
Meter/No Trait
b1~Freeze, zap, 11, 11, 3~scoop, 3~breath = 42%
b1~freeze, f3, 3~zap, 11, 111~scoop, 3~breath = 44%
b1~freeze, f3, 3~zap, 11, 3~scoop, 3~breath = 45%
And If you feel like throwing away lots of meter, you can also B1 MB Bounce cancel into all the F3 starter combos. Good damage, but not really worth the meter (especially if opponent still has clash). Plus i imagine eventually everyone will be able to block superman's overhead on reaction.