Yeah 250 isn't viable IMHO. 165 was awful for me on the EU servers, I couldn't play on that. 100 on East US is fine, though a bit of a crapshoot at range. In particular I can't hit anything that flies, though unsure how much of that is me being crap.
While we're here, htf do you use the jetpack? Isn't it the F key? It's worked once and never again. I can see the power bar thing in the bottom-right corner so pretty sure I do have it equipped, but nothing happens.