"Actually, Laz, I said Less than 100, probably a lot less, and most of those were as a manned gunner in my bomber. Do you want to compare ground targets killed, Hero?"
Sure..  Let's compare ground targets killed with 6 fifties only.  If I killed it it was 99% certain that I killed it with 6 fifties.  And... No plane comes close to killing me as much as say PT boats do. 
I would think that 10% closer fields would be a pretty mild experiment that would do no harm to anyones gameplay.  
lazs