I know Rising Ice isn't tournament allowed (yet), but anyway I've been labbing it and I think I got the optimized combos. If anyone manages to squeeze more from it let me know:
"Starter" = B14 for footsies, B32 for low, 21 for punishes (all deal the same damage, 12 punishes deals 10 less in every scenario).
I'm listing the "easy versions" on the Midscreen combos because the damage drop is of just 1% and the execution on the easy ones is really easy, leaving the optimized ones for bragging as that 1% generally isn't worth much.
Midscreen:
(Starter -> Iceball), JI2, 21xxRisingIceEX, B2, B143xxSlide = 309.69 (333.24 with initial JI2).
Easy Version: (Starter -> Iceball), JI2, 21xxRisingIceEX, B132xxSlide = 298.72 (323.91 with initial JI2).
F2xxRisingIceEX, B2, B2xxIceball, JI2, B143Slide = 293.13 (319.16 with initial JI2).
Easy Version: F2xxRisingIceEX, B2xxIceball, JI2, B143Slide = 283.51 (310.98).
(I've been trying to do the crossover kick finisher for the OH starter but no matter at which height I freeze the opponent, B143 won't connect after the first hit, and even if it was doable, the corner carry of this option is great).
Corner:
(Starter -> Iceball), JI2, B32xxSlide, 21xxRisingIceEX, B143xxSlide = 356.57 (373.09 with JI2)
(If you try to add any standing one before the "21xxRisingIceEX", then B143 won't work)