RE: trimm questions for sonic 85 & isonic 115
Good choice of boards for your sail range. I used the same set up of boards, and sometimes the Isonic 125 for lighter wind.
For the Isonic 115 I would place the foot straps all the way back for all of them. Mast track position I aim for the middle and then slide it 1-2 cm back. I use the same setting for all sails for the 115
For the Isonic 85 I would place the foot straps in the outside holes all the way back as well. If you sail really choppy conditions, then take the front holes. I use the same setting for all sails on the 85
The fins supplied is good all-round. But upgrading can change the performance in a positive direction.
For the 115 I use the Vector Fins Maui G-10 Canfire in 38cm
For the 85 I use Vector Fins Maui G-10 Rockit 32 cm. This fin I use in all conditions for all sizes.