Hi Randy and the rest of group too--You are on the money on your advice-- had a conversation with Bob Davis today and he said the same thing you stated most of the problem of over compression and than running rich is the result of too LITTLE prop load br running
a glow size prop or one just slightly larger it requires more compression then richer and the temp goes up. with the increased load
you then DECREASE compression and lean it out it then sounds right less labored and much smoother and cooler . my norvel 061 runs an 8x4MAS
and my TT10 an 8x4 MAS the norvel instructions read a 6x3 on glow the OS 10 reads 7x4 so sure the TT10 the same and the TT is still
a little under propped I may go a 9x4 which will bring it down to the 9000 range and the compression screws are at least 2 turns out
from the bottom the TT61 had so much compression as a glow it needed 3 head shims before I could get the screw out far enough
to get the diesel miss and swinging a 14" prop (do not remember the pitch)maybe 6 0r 7 martin
you can increase the prop load 30% over glow