Air/Combo Boost

[Rizzice]

These are the abilities that increase damage of finishers based on number of hits in a combo.. but I'm using fenrir and negative combo.. causing ground attacks to go straight to guard break and explosion, and air combos to hit once before finishing.. so are the air/combo boost even beneficial whatsoever? I heard they could even decrease my damage since the combo multiplier would be 0 hits in the combo..

EDIT: I also noticed that slide dash and the aerial version of it don't work anymore?

[Zeromus_X]

I guess they do. Then again, anything with 'combo' and 'boost' is equipped automatically when it comes to me.