Time to death, dying behind corners

Two issues I've noticed consistently across matches and modes:

1. Time to kill (TTK) seeming very different than time to death (TTD). I shoot enemies and they die in what appears to be a normal time. I then perceive that I am taking deaths in like 1-2 frames of gameplay at times. And not from snipers but from SMGs, LMGs, and ARs. This was an issue in the beta as well.

2. Dying around corners. I noticed that I'll often be behind cover but an enemy is killing me despite this. Or I'll take some damage out of cover but then retreat to cover and still be shot at, damaged, and ultimately die. It's a FPS. We all die sometimes and sometimes I do dumb things and the enemy should absolutely kill me. But on my screen if I retreat behind a wall then it's obviously bugged if someone can shoot at me and hit me behind that cover despite my screen showing that as an impossibility.