I ran the 0.4mm HG and got detonation at trail speed. This was running a 50 pilot, 165 main, middle clip position and two turns on the air screw. I found the bike also did not have as much over rev and it liked to be short shifted.
I'm now running the 1mm HG and I have no detonation, power comes on just as strong but it has a nice over rev. I'm running a gnarly pipe and reed spacer and Eric Gorr ported the cylinder.
Perhaps I could of did more jetting with the 0.4mm HG on, but I do like the 1mm HG better.
I'm 230lbs and in 3rd gear with 14/51 gearing this thing can chuck me with a little throttle blip if I'm off guard and lazy and I'm sure it can do it in 4th too.