Bill, before you look into a new sponson kit. Ask Joe if these sponsons have dihedral in them? It was my understanding that the released kits that you have were not going to have dihedral. My source told me that the sponsons were going to be of the Tom David design with flat bottoms. JJ sems to know everything though. Ron and I both ran into a handling issue with the dihedral bottoms on the sponsons. A standard flat bottom immediately corrected the issue. I was the first to give it a try and Ron followed the change right after.
It is possible that they found another way to correct the problems that Ron, I, and one other person was having with the pre-release kits.
None the less. It is a great little rigger that will make a great boat kit for everyone.