That`s the size I have at the moment yes.
I don`t think ratio would affect your planing.
Cup is the only thing that I`ve found to affect planing. Second drive depth.

I can have a prop scanned and look at the cup numbers and tell you how long and at what RPM they will plane at (if at all) pretty much at this point.

7" down from the tip is the cupping that counts ( on my boat).

I also have these

Mercury Speedmaster SSM Cleaver prop 17.5x 33 big shaft | eBay

Willing to send out 29s next season? Or are those your golden goose? I can lend you my 30s in return....

I have three sets. want to sell one pair of 32s but they are so hard to find that I want to hold onto them until I see what spacers do.

After a season of searching and trying those are my best props right now , and fastest . sorry they are staying under lock and key.

I still plan on looking for my lost set now that i`m scuba certified.

I fully understand. These props are hard to find, don't blame you one bit.

Cleavers or round ears?

Boat is planing and running good with 30s now (with more fuel, it planes a bit slower). I hope to grab the 1" spacers from the Swap shop and test everything come spring time. Just glad the engines are running, fun stuff yesterday, I doubt this thing will have a problem getting over 100mph when setup properly.