sounds like the balance is off on the tune. lsn should be just in from flush and the hsn should be in about 4-5 hrs. here in the south we have EXTREMELY high temps and HUMIDITY. i have had good luck with adding a
.004 shim (copper) and the p4 plug. helps with opening the TUNING window alittle bit. you can try the p5, with the SIDEWINDER STRYKE TEAM fuel it worked fine also.

engine is alittle cold natured leave the glow igniter on for the first minute or so helps bring the heat up in the engine alittle quicker.