A few years ago I and some others around here tried PowerTech's offshore
style props. Both of mine spun their hubs on the first offshore trip. They
other party's props spun while testing them in a lake.(unfortunately mine
spun way offshore). So I would be leery of them in high horse power
situations. What made things worse is that they bent me over pretty good on
the return and were not even the least bit apologetic. Left a bad taste. On
the other hand, prop people tell me the blade design is good and in
outboards where you can run a high drive height ( a bit difficult for you)
the large blade hooks up good. However, spun hubs sort of put that in the
theoretical category for me.
Finally, no all ss props are not the same. I am using Turbo brand props they
hold up well and make some props ideal for sterndrives. you may want to
price them for your boat.

--
Ron White
Boat building web address is
www.concentric.net/~knotreel