the idle to half throttle will be your pilot jets and your clip, but your mains are way high man, Im at like the same sea level over here on the east side of town but i have... Toomey T-5's, aggressive trail port, wiseco prolites, 20cc dome cool head, +4 timing, eliminated air box lid, welded crank, and ported reeds with dual stage petals and I was using 330's in my carbs to do my heat cycles when it was 50 degrees out I think I was a little lean and should have gone to 340's but with all the other mods and 20 degrees cooler, I would think it's something else.