From this distance and without doing a lot of other checking, my suggestion is jetting, jetting, jetting. Start by putting your needle clip in the next to top position. Then change your pilot jet to 40 to 42 to get in the real world. Try this out and then work on the main. Bike is loading up with fuel because of the ultra rich pilot (air screw position does not make any difference). When you open throttle, engine literally has to clean out fuel surplus before it can begin to rev and power correctly. Just guessing, but at 4000 ft I suspect you will end up around 40 and 152 on jetting. Cheers John