Well I raised the motor a hole and rpms increased to 5,600, but speed stayed around the same. Still running the mirage plus 17 pitch.
Seeing as it's frustrating the prop will ventilate when accelerating in a straight line (flat conditions), my priorities are primarily the prop that has the most bite. Also since I have no trim tabs, the prop with the most stern lift would be desirable.
Re-reading everyone's replies, seems like the REV4 is the ticket. Any objections?
Since I'm only seeing 5,600rpm with the Mirage Plus, does it make sense to go with a 15 pitch Rev4? I'm concerned about the rpm loss