I'm pretty sure the weapons are fine as they are, no need to make humans overly powerful.
inorite it will make the game unfair and the zombies will rage quit
and the humans are already to powerful what is adding a minigun a whatever else your adding going to accomplish other than making the zombies rage quit
and the mini gun is going to be abused because they will spawn camp with it again making the zombies leave
unless your adding something else to the zombies like double health or regen health
so basically if you add the new weapons but don't help the zombies ZS will slowly become lifeless
because there will be NO ZOMBIES!!!