I think the prop may help, but I'd envision the shower pickup in the water flow is doing most of the work.

Your anti-ventilation plates out of the water at speed? If so by how much?
If a Bravo drive is surfacing at speed and the top 50%, 40%, or even 30% of the prop is out of water. I don't envision the prop pushing any water into the shower.
I'd have to see a video to prove that the prop is indeed pushing water up the shower in that situation.

My boat is a notched transom. Boat runs great. Takes a sec to learn how to feather the throttles to get it on plane but it’s a quick learn. I just was wondering if the showers would get enough water. I just can’t see how it can. Currently running a 5 blade because of the prop being partially out of the water so I don’t know how those pick ups would suck up water. But hell what do I know

Look at how much water a surfacing or semi-surfacing drive throws, ie rooster tail. That’s just the water that makes it past the splash plate, which is directly above the prop where the drive shower pickup is located.

I don’t have any go-pro footage, but I’m pretty sure my rooster tail starts behind the cavitation plate

Guess we have ourselves a science project!! 😆📐✏️📚

I said I have a high X, never implied that my drives are surfacing, No go pro footage to investigate. notched transom, my guess is the Cav plate is right at the point of surfacing. I will look to see if I have any shots from the Helos from past poker runs that might shed some light on depth. Will post if I see any that will show what we need.

A few weld bungs and a thru-hull.

Engine water with a pickup, and then use the drive pickup for the shower, this way you will get water circulating thru the drive.

Cool setup and I bet it keeps the drive nice and cool. Curious, do you have a pressure relief anywhere in the line or is it all just forced through that line?

I know you didn't, but you did say the prop forced water into the shower.

I know there are variations of drive showers.
But speaking of Simrek.
Go to 3:50 in video below. The pickups are pointing forward and way ahead of the aft tips of the prop.
I'm not saying there is no way. But I'm not believing that any water is being forced into that shower by the prop!
Aside from the Simrek. I think they still need to be in the flow of water to be force fed by that. Not the prop.

My thru-hull water pickup does not have a pressure relief valve yet, closed cooling so the water only goes thru the exchanger and exhaust.

but I'm adding a sea strainer when I switch engine.

For the drive it's an AN-10 hose thru hull with open flow, so no relief there either.