Personally I don't think it's anything to worry about. You have the 46mm puchonda head off treats with no decomp on it, right? I don't personally know what kind of temps to expect with that head but I max out at like 430 with my stock head w/sealed decomp. The highest I've hit was 500 before I sealed my decomp though.
Speaking to DPC's point, what's the top speed you've hit? And are you getting better variation now?