Id rather they buff the benefit of upgrading. Weapons that only get like 10-15% damage increase should be buffed, more ammo per upgrade to compensate the weight increase, better block and parry effectiveness for melee weapons, wider ground fire for firebug weapons, maybe a minor increase in fire rate and mag size on top of the damage upgrade for automatic weapons, etc...
Also, I think now is the perfect time to make the survivalists weight bonus into a passive.