Use slash procs with your melee first before starting to spam whipclaw, slash procs from the ability itself will not count
It's hard to get full combo if you are being pressured a lot or if it's vs infested... So you are free to swap rentless combination to true punishment

If you are lucky to get an status effect that isnt other than slash, you'll be able to nuke anything

I have an crit/slash/damage riven which gives me 20% chance on red critting, it's weaker than sacrifical steel... But it's really worth it getting the roll that i have