You can probably find the red Scotch-brite pads at a grocery store also usually with a sponge attached. I've found both the red and green pads there.
You're not modding the props? I can see where the stock 440/3 would work as most people don't really know about doing mods on them, it's kind of scary for a lot of people.
Have you tried the M-440?
Also on the turn fin, I'm wondering about it having 2 right fins instead of one beveled for the left side.

I'm kind of playing Devil's Advocate here as I'm sure that these questions would have come up sooner or later.