a 17 p would reduce wot rpms to a lower rpm than the 15 p, it would actually cause the motor to work harder than it is with the 15 by over loading the engine, lugging it, it would be like trying to run you car uphill at high speed, in overdrive, towing a boat. you would have less rpm, but it would actually be working the engine harder by not allowing it to turn enough rpm to make the needed hp. The most common cause of detonation and tuliped valves on I/O engine is overproping, it can burn pistons on OB's
are you running a Mirage, or Mirage plus?
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