you're making too big of a deal out of this. enchanced pulsars suck ass. use aprippers, appirces, anything, who cares. enchanced pulsars drain your energy to hell if you keep firing anyway and they only do like what, 5 damage?
please, you're better off using the SMG.
last i checked though, when they hit you, you couldnt move, so you'd be dead before the guy with the gun ran out of energy