It should have a larger main jet than stock with that setup and the 45 slow jet. Fuel will puddle in the bottom end from the super rich stock slow jet making it seem rich all the way to full throttle. Then if you make a really long wide open throttle run, that fuel burns off, engine goes lean and burns up. Once dropping the slow jet, then do a plug chop at wide open throttle to check that. You may need to go up a size or two.