RE: S-type 115 or 104
I used the severne 6.7 ssr for the 104; a v6 7.5 on the 115.
I do have a 89 liter board for very strong winds...
The carve 111 seems a pretty good option too.
So the choice: stype 115/ stype 104/carve 111
It would be great to be able to use a 7.2 V8 on the board of choice.