I spoke to Todd @ Hydromotive , More than likely on my Skater I won't need vent holes , on a heavy vee bottom yes . The bad news is I have a Quad 4 - X which is more of a round ear bow lifting prop. need a pair of 30 Quad 4 , they are more cleaver style .

Larry

The props will fit if they have square bores to accept the HD inserts.

I still think you will "benefit" from venting the props.

The rev limiters are low, the boat is efficiant and the pitch may need to be raised from 30. This will create low end issus. May only happen with full fuel and people. Remains to be seen.