I just finished my third gallon so the engine is broken in. I have also switched from 716's to 766's. It is flying very nicely with the 766's. I do not to work on my collective management with the 766's though. I'm running my head speed at 1800 with the 766's at this point. I kicked the head speed up to 1900 on my last flight with the 716's. That actually felt pretty good. I may go back to that at some point. So far I am very happy with the setup. I will try to post a video in the next week or two.