it is amazing what the vents do.
I have had props that are just terrible for trying to get out the hole, vent them and hang on for dear life ha ha
violent is perfect word for when its right, I have one I recently done and violent is the perfect way to describe it.
atleast you know those big holes are working good for you,.
a low pitched prop with vents would rip a few skiers out the hole very good, just need to make sure the transom is up to the job of
getting the power on the prop so fast.