Large Prop Diameter is NOT your friend if you want speed and to turn max RPM's. So if you decide to go with an enertia, you want the original smaller diameter enertia NOT the ECO enertia
In my experience the smaller original enertia turns 200 - 300rpms more for the same pitch mirage plus. It has less stern lift, but it's a faster prop. If you turn a 17p mirage plus you can turn a 19 highfive. Highfives are small diameter 13.5" vs mirage plus 17p which is 15.5". Highfives also have thin blades like the enertia (original NOT eco).
See this thread: It's a sticky in the performance section.
http://www.classicseacraft.com/commu...ad.php?t=28564
and read this one twice
https://www.boatingmag.com/boats/choosing-right-prop/