Thanks...
maybe my airframe is too big...
HL Yak-55.. it works well, inverted torque rolls, complete reverse, etc. etc. but short flights... but now that I think about it, I think I am getting 4 or 5 minutes..... I guess that is close to normal for these setups...
I was just used to 8 to 10 minutes or more with normal setup.....

Thanks again