yep thats it on the fat side, i would try to go back to your baseline setup and lean it out a couple of jet sizes, i would deff try more timing, it is a 4 cycle engine no matter how many cylnders it should take more than 30 deg unless your using boost or nitrous, in some cases add more jet and add some timing to add some power . if your fattend up the carb then id try more timing if it dont clear it up then id jet it the other way lean it out.
