In my oppinion you should learn to play tighter, instead of getting a warp feed. If you spent your time learning to play 'tight' with a warp feed then im sure you'd find it very hard to switch back to a normal setup and play well.
Practice playing lefty, and practice your snapshooting whilst showing the smallest ammount of yourself as possible for a very short time. As thats all playing tight is! It takes under a second to shoot one or two balls, and thats all you need to hit fools. So dont stay out of cover any longer!
Also if you dont give them something to shoot at, by concentrating on where everypart of your body is (Such as your feet, pack and elbows) then youve got little to no chance of getting tagged..
I think theres a common misconseption about warp feeds, that they make you play tighter. If your technique is good then your hopper should always be directly infront of your head when shooting. This adds NOTHING to your profile!
If you like warp feeds then fair enough, but dont go and buy one thinking it'll improve your game, cos it won't!
Peace