Diameter is going to be an issue with the ECO enertia and that 200 merc (16" is too big) 16" will just barely clear the cavitation plate. Use the older Enertia's. What were the max RPM for both props? Make sure you can spin that motor to 5800rpm with the prop you chose. I'm surprised you didn't like the mirage plus. Play with the engine height and PVS plugs before you give up on it. If the engine height is too low . . . the ride can seem a bit harsh with the extra sternlift.
FF - I never got to try the Enertia on the 20MA. I do run a 17P enertia my 23 now . . . it'll turn about 300rpm's faster than a 17P mirage plus. On the 20MA I had a LOT of fun with the highfive, but it wasn't the fastest prop.
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