Hi I run older KA race sails on my Tribal boards. So far this summer I have experimented quite a bit with strap locations and mast track and found all of these boards share a similar sweet spot. At least for me and the way I want to sail.
My setup is targeting rear strap 3rd hole from the rear in the railside cluster. The front is also railside and approx second from the front. See the pic. This setup for me is well balanced front rear with less curling toes to hold on and good back foot pressure. It also stabilisers the board to a near auto pilot level and improves upwind performance with smaller fins.
The mast track location is super important for board trim and performance. Even slightly too far forward pushes the nose down increasing board slap on chop and pumping up drag My sweet spot is shown in the picture.
This spot gives me ideal trim control and ability to easily flight the nose over chop. These board absolutely destroy chop if set up right and give a lot of confidence to push it harder.
The other benefit of the right mast base location is ability to run smaller fins without much spin out.
I have experimented with big and small sails large and very small fins and I keep coming back to the same spots.
Your sails will likely behave differently to mine but the idea of getting the trim right and not overly pushing the nose down will probably be the same. Happy sailing.
