Too lean.

Go back to your original settings and lean it out slowly , also do you have a temp gauge? If not get one and keep the temps below 220. That will ensure it doesnt blow from overleaning , which the motor will get real hot....above 220F. But just to note some dont go by readings and some say 270 is ok, just whatever makes good power. Ive always played it safe though and kept my motors at 220-230 if racing. But thats about all I go, anymore than that and I get antsy.