Give it a shot, I think it'll work out nicely. The pictures look like your wave is really long as it is, so more rear or rear/side weight will make the wave taller. You might try to get the extra sack sitting half on the seat, and half on the sundeck on the surf side. Grag those extra orange jackets that we all carry for some reason, and use them to bridge the gap from the seat to the deck..... make sense?