Run with LPL cooldown and range modules. Twelve DHS's doesn't sound like much but that -10% heat generation quirk goes a long way. Punch 33 points of armor away with the best weapon in the game and then get in close to finish them off with the two MG's with the +20% ROF quirk. Did I mention that you're also fast as fuck? The 'Wacker's pointy nose makes it great for rolling damage across the ST's and CT much like the Crab, but if you feel like you can't quite handle it then you can use the STD engine version below. You go from just over 100kph down to about 80kph, but at least now you can zombie with a single LPL.