Hello JFAB.
Sorry to bother you, but I saw in you a chance to solve my problem.
I saw you walk the Reds, and Hotbodies,..... by coencidencia I too, am one of the few drivers of Brazil that uses HB.
I'm currently using R5T Reds, however he has no strength at low ... I used 30% nitro fuel. changes already did all that I thought could solve.
1 - put a washer on the engine of 0.2 m,
2 - put spring clutch 1.1
3 - used shoe nylon and aluminum.

I can not close the needle as it is already at 110 º C

some people told me that the clutch D8 is not good, I think it is not true, because already used with other engines and had no problem ...

you have any idea what can be?

I really appreciate the attention!