So I have a 2009 polaris iqr 600 and I trail converted it everything but revalved shocks. It has vforce 3 reeds and is regeared to top off at about 100 mph maybe a little less. I have the oil injection kit installed on it. The timing box is on G. For jetting as of now it has the stock 450 mains and 55 pilots and needle on 2 position. The clutch is set to engage at 4500 rpms. So what my problem is, is that I have a really bad low end bog from take off all the way to 7000 rpms and once it gets to 7000 it stays there for a couple seconds then gets past it and really opens up and has power like a sled should. We have tried different jets such as 410 mains 45 pilots and 2 position on the needle and also 3 position on the needle. It isn't the reeds, power valves are clean too, I run 91 octane, the oil injection is opening and closing at the right time, and I have tried 50/50 mix of 110 and 91 octane which is about 98 and still the same thing. I need help!!! Would it be the clutches?