I would work on the 60 ft. times, try different stall speeds, air pressures, shock settings and so on As far as the 1/4 MPH have you tried jetting the carb. up fat enough to slow the MPH down? If not try that, if you can't jet it fat enough to slow the MPH down in the 1/4you need to fix the fuel delivery system Let us know what you do and the results BTW, are your SR 440 port or Max Wedge size? If 440 the porting them to the M.W. size will help also, more air and fuel equals more power