Hallo Geoff! I use the 28cm Duo with 7,6 Stealth and 115l. Upwind more than okay.
If you are not so fast, no problem to get back. Last weekend tried one of my friends
the first 28cm Duo Weed in rake 30 °, she is than 31cm vertical deep. Upwind better,
over 120l board and 8,5 mē. Look: www.cameraid.com/Lessacher