Maybe we are just playing the game completely differently but i even use a suppressor which doesnt help with any sort of gun control/bloom, and i still win close quarter fights against assault class shotguns/m433 alike as a support class. I consistently get 3-5 KD per game as well and only time i feel the effects of bloom is just further distances, which you're not meant to engage effectively anyway. The blue laser keeps so much of bloom in control on top of its tight hip fire i literally cannot feel much of a difference.
going prone/crouching with good positioning wins you fights much more than raw reflexes do. Playing smarter pays off more than running around and dying in a second, you just need to be more situationally aware on map control, enemy spawns, flank routes, teammate deaths, good offensive/defensive smoke grenades. I can pick off enemy flanks and get behind them a lot of the time and get pretty good kills that lead to game winning positions especially when it's practically trench warfare.