I would adjust the EPA first, especially before buying a motor if you've already got a 5.5 and your just starting out again. Your Etronix has EPA, it basically just reduces your throttle, so will bring down speed and torque.
If you run into any temperature issues or can't find a setting that works you may want to look at a slower wind, but you will probably find other things to spend on before going for the ultimate power curve.
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