That was one of my concerns as well @jkbMy opinion on using S-wings on a shorter board.......get a twin set and get a stiffer construction.
I felt the thruster set lacked drive because the fin bases are fairly small. I could also feel the fin cavitate through bottom turns.
There is something special to them for sure. They feel amazing through roundhouse turns but I think a larger, stiffer set would solve the problems I encountered.
Speaking of exotic fins... does anyone have any feedback on the C-drive fins?