TTD, bloom, and hit boxes

I for the life of me can not get consistant kills it literally feels like the opposite of aim assist on KBM. I get 5 plus hit markers in .5 seconds and then die instantly from what feels like 2 or 3 shots but it'll show i got shot 5 or 6 times. Dice needs to nerf the SMG's and buff the DMR's then work on the bullets hitting the cover infront of you. This dumb stuff is infuriating.