I had this problem after switching to my stainless creations intake. I never did get it properly tuned out. Same exact symptoms, bike would pull hard up to about 3500 then it was like I hit the rev limiter. In neutral it would go right up to redline. You've already got it in the shop, but if they can't get it, try removing your stock air filter and see if the problem goes away. Also try going a little bigger on the low jet, I think 034 is the next size up. You may be running out of gas just before the high kicks in. Doesn't the accel pump only kick in at WOT? Also, why can't we start our bikes with the enricher on? I never heard about that?