As soon as I got my T4.9, I had Calvert make new sails. That is what my son, Dave, used at the F16 event.
Pretty funny that the guy crewing was not a sailor, but he learned fast.
The stock sails are designed for a sloop rig, thus the bottom is flatter and has the draft farther aft.
I had Calvert also build a uni sail with a fuller bottom and the draft farther forward.
At any rate, Calvert is familiar with the boat.
Rick