I have a DA-50 and a menz 22X8 prop turns 7150 Im on my 4th gal of the 32:1 lawnboy ashless mix and ive noticed at high rpms under load it sounds like it has preignition like a pinging should i be leaning it out? Ive enjoyed the way its performed so far hate to mess it up now that ive fallen in love with this thing. On approches i bring the nose up till i get the speed i want then just glide it in more often then not i have to blip the throttle just to keep it from going to slow. so speed with this prop is not an issue.