Check out the True Ames Sweeper fins;
The curved planform of these fins will make learning to jibe a bit easier.
You have the centerboard for going hard upwind (if required).
The Sweeper can be ordered in Deep Tuttle.
54 cms should give you excellent performance on your Rio M.
What happened to the Drake NR 540 mm that was supposed to be supplied with
your new board?
Any sort of 52-58 cm vertical pointer fins will work well on the Rio M.
Actually, you might want to look in the used fin bins at you local winsurfing retailer.
There are lots of stock 50-60" Tuttle base fins out there that will work to get you
planing better/earlier than the 41 cm Shallow water fin you are using.
Last edited by Roger; 12th October 2011 at 08:22 AM.