Heres where the IFR are located, usually in the top, but could be in the bottom as pointed out. I had same issue with my Dominator and tried several power valves, PVCR's . What fixed my issue was getting the T-slots correct or at least close. I still get the issue on hot summer days with pump gas, but if I add some race fuel to the pump gas issue goes away. My cruise was on the rich side as well (13.5-14)just as I like it and still had the lean tip in. It is better to have settings on the fat side vs the lean side. Your engine will be much happier.