Moe has a very good point. Don't assume it was set up right new. Also doing 1 thing at a time with a test is the best way to pinpoint the problem. My bike has always jumped as soon as I hit the throttle and does take a fuel injected Hardley twice its size. It is a hardley so not saying a whole lot.I have never noticed any lag but I have never had anything newer than 1972 except a 2 stroke triple Suzuki and thats a whole different animal.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!