OK, Thanks for all replies!
I'm running 16% nitro (highest EFRA approved) and a long #6 (I heard there's long and short, I used to run a short #5 before) and a pretty short Protoform Astra body.. The track I run at is pretty fast for those small 1:10 cars, do you think a #7 is worth a try? And in case of "yes" long or short?
Thanks again for clearing things up!
P.S That's what I call tempgun!