I had one of the cheaper ones (MSR) I think, it just changed the leverage (traded a long throw for less effort) and I never liked the looong throw. I don't know anything about KDX clutch springs, but haven't heard anyone bring them up, so they don't seem to be causing problems. So, yours may not be stock. The Barnett clutch kits I have used all have much stiffer springs, required much more effort. You might pull your springs, (for a size reference), and go buy some 125 springs. First replace every other one, if still stiff replace them all.