my hit% has been consistently higher than 15% for a year, and has often hit over 20% during several tours. i have always used tracers, i hate having them off. treize, do what you feel comfortable with. the myth that turning tracers off gives you a better hit% is total BS.
i just couldn't shoot right without tracers, seeing as i usually fire while pulling G's in different attitudes.
i tried for a few weeks with tracers off a while back, and my hit% during that time was 4-5%, soon as i turned it back on, it jumped to nearly 15 by the end of the month, which considering i had ballsed it up that month with the tracers off, wasn't bad.
i've had a hit% of 76% at one point simply because of the way i kill buffs, but that died by the end of the month because of anti fighter stuff of course. i think because of things like that, that any study of this type can't be too accurate.
i find that batfink has great aim, and whenever we duel, he lands incredible shot that i wouldn't dream of even taking, but he says his hit% is never much over 8 because he takes crazy shots in the MA's. all depends on how you fly and how you like to shoot rather than how good your aim is...