The mobility issue.

[Phrot]

I think it would be fine for most mobility items (keyboard, lightweight, vorpal, etc.) to stay the same, but mobi on kill needs to be toned down to another level. Some guns without boost mobi can be annoying but then you add the fact every time they get a kill with that annoying gun, they become even harder to hit and track, and it just causes a slew of issues.

tl;dr, regular mobi items are fine but boost mobi needs to be toned down with a cap or just less percentage on kill