Have you installed a jetkit? I would try that and see if you regain your lost power. I don't see how you lost any power though,that is such a lite tire you should have lost nothing. I like the epi clutch kit that was installed on my bike but the only reason I did it was I lost some power in thick mudholes. I have 26 mudzillas which are a lot heavier than the mudlites and the only time I could feel the loss in power was in the mud. The jetkit is less money and pretty easy to install yourself