Q
hello daver_777,
As it is explained, it is due to advancing blade.
when advancing balde pitch increased the Q will be decreased and vice versa
for instance, torq will be 2-3 psi decreased, soon you forward the cyclic to increase speed during high performance take offs. (making cyclic forwarded causes advancing blade flaps down, that is, decreases pitch)
and, advancing blade drag increase is always much bigger than retreating blade drag decrease during cruise. all this stuff is sensed by overspeeed governor. ah-1p pilots know better that q variation.