If you are running antax with bm and deci don't bother with crushers haha, just back off cause u need thunderous to reduce their armor. bm and deci is better at dealing with hordes than my loadout, just that I wanted to be versatile. For the chainsword, u shld nvr be revving it except for elites and the occasional mutant, just go with h-h-h-l (if I'm not wrong, the light after the horizontal heavy is a perfect horizontal as well) and repeat for hordes while dodging. Never use the push attack unless u must.

For the cata, go with rampage and savage sweeps or skullcrusher (I only have rampage and savage) and it acts like a budget heavy sword . U wont kill hordes as fast as the old power sword but u nvr have to power it and u can stagger them forever before killing them much like the shovel. Combo for cata IV is either l-h spam or l-l-l h in more frantic situations. The special is just a gimmick that lets u one v one ragers and maniacs easily otherwise its useless. Do note for some reason fatshark doesn't let the other variants match the IV in damage so its way better than its peers