At least you can hit! I took a G10 up against a p47 (was silver, so I suspect it was a -D), and we flew around each other for about 10 minutes fighting, and I could NOT hit the little sod worth crap. Even when he was stalled out high over me and I had a PERFECT shot on him I could NOT hit him with 30mm (and this all at ranges around 200-400), no matter what. It wasn't until I sprayed 100 rounds literally at him point blank that I finally knocked a wing off. (HTH arena, lots of ammo)
The 30mm definitely is... um... "odd" in not being able to hit squat anymore.