It's not your jetting, that jetting is pretty fucking spot on . You have other issues. Ask them to perform a leakdown test on it . If it did have an air leak you could have squeeked it . It's either electronic or airleak. I don't wanna tell them how to do there job but a leakdown should be performed before they take anything apart. I would say there chasing an issue on the side they changed carb on. Just a thought. On a side note there's 4 dealers in my area that bring me all there two stroke stuff , there mechanics no nothing more than uncrating brand new machines and assembling them and that's a stretch most of the time