So basically you still want freeride gear. Thought with the small sails you were using wave sails. Keep your F122 and add a F93. You are overpowred on the St115 because its too big. The F93 will still be fast, but comfortably fast, there is a big difference there. With your light weight, make sure you use very small fins in high wind, this will help a lot also. Say a freeride 26-28cm.