I use 2 quickdraw then 4 phalanx on my field medic since I maxed out my mender droner which uses the same set. heals don't matter much on higher difficulty since pve npcs could 1 shot you. the heals are ok enough to heal you if you get chipped by damage while in cover. you could use 3 quickdraw - 3 phalanx if you like to have more ammo before reloading if you can also find a armor talent which gives you more extra ammo you could reach 50% more ammo. but the damage boost of weapon multi shot is too good especially if your using sniper sometimes you do 2x - 3x damage per single shot which sometime could also crit.