I have what I believe to be some form of Dynojet needles, with the funky taper. The problem is, when on the correct groove (reading the plugs), I get a medium stumble when whacking open the throttle quickly. The more I lower the needles, the better the stumble gets until it finally disappears, but at this point, the plugs are coming out bone white. So it seems that with the clips on the correct grooves, this crazy taper (I'm assuming) causes a slight cough before the power comes on. It only happens below 7500 rpms. Any thoughts?