Hey there, some updates!
First, after practicing the random shit into Momiji combos relying on 5a whiff 6aa 6c, it seems 5c4c2c is a better starter than 4c5c2c due to one less reverse beat.
As we all know, in Melty aerial counters are your friend. The fullscreen Momijis work from jb or jc air coutners, netting 5k+. In order to work from ja, you need to have forward momentum, as otherwise they fly off too far away.
Also, if you are near the corner with your back to it, you can go for this combo:
2a5c4c5a6aa 4c5c2c 5a (whiff) 6aa 6c 66 2c623b 4c2c623b (x2)
It does 4723 damage as opposed to 4782 if you go for 6c 66 5c4c2c without 6aa loops (tested on VSion), but nets a whooping
142.5 meter, while the other one gives 123. This actually gives more meter than the 6c loop, which totals in 135.8 with two Momijis in it. The timing is kinda easy once you get the hang of it.
The only thing that can't link into a Momiji is j22b, haha. It is really nice that she has these high meter building and long combos, so that while doing them VAkiha can get her red life back.
To whoever's gonna main her at Evo - grind dat 6aa 6c! And good luck!
EDIT: Going for 2a5c4c5a6aa 4c5c2c623b 4c2c623b (x2) from around midscreen nets 5110, this has to be her highest damage combo from 2a. Damage climbs to 5231 if you go for aircombo ender.