Shoulder Charge already is a tactical, situational perk to use. It requires you to run out in the open with no regard for defending yourself, close to within a few meters of your opponent and not get mowed down in the process by a shotgun, auto rifle, fusion rifle, sidearm or hand cannon. There is no logical reason to nerf it when shotguns are still the dominant special weapon used in game. If you want to play the long range game, then you should be susceptible to anyone who closes the gap on you to get the upper hand.