Might want to check the Malibu site for recommendations on props too. I have not seen much on prop stuff recently here on WW. Last summer there were quite a few threads with good info.
I have not tried different brands… but I do have a SS Cutter prop and have had no problem with it. I think it's and 18.5 vs. the stock 20 that I had on my Maristar (4 blade). Yes I do get better holeshot now and it holds speed fine even with 2K of ballast. Lost a bit on the top end… not that it matters.
If you get one at a local shop they will probably let you try out both.
Check the post on the Download Ballast system and send an E-mail to Porter. I know Mike got a new prop on his Tige and swears by it… I think it was an Acme?? Good Luck.