What RPM are you spinning this thing to? I would hope at least 7500 rpm if not more. Also C-16 is the best fuel to use with Nitrous. 110 or 114 not really made for Nitrous use. Nitrous is an accelerant and thus wants to burn ultra fast, t0 fast for the burn characteristics of the 110 or 114 octane fuels. Also how much timing is being pulled out of the engine when on the juice? How much timing are you running when not using the Nitrous?