Hi Pete
You are right with the Vector Volt 38 / or 40cm if you are after max control, but still heaps of drive to push upwind easy. I'm not surprised that your 28 weed fin can't quite give you the performance upwind,,
For the Manta 69: If you keep your current 42cm for the lighter days , - then the 38cm (like you say) would be the choice.
If for some reason you want 2 fins, - then 40cm + 38cm would be the choice.
The Volt model have a lot of control and keeps the nose of the board down. The design / outline has a of the leading edge has a slightly swept back profile towards the tip and this adds to the control. The relative wide base section of the fin take care of the upwind ability as well as acceleration. All up the Volt is amazing All - round performance and is the newest of the Vector designs.
Please send me a PM for more info on :
[email protected]Cheers
Jesper