OK Spider, you have my attention.

Help me understand what I should do to "prop it out to 6000", I'm all ears.

The prop I have is a 3 blade Saltwater Series II
DIA: 15
PITCH: 21

In some water conditions and with the boat trimmed out just right (I have hydralic trim-tabs), I've seen it get to 5300 RPM, but this is rare.

I'm open to suggestions on how to get improved performance here.