Ok so thread update. Today in clinic my son rode his chopper for the morning session and then I had him try the Capita again after lunch. I figured this would give him a few runs and get him in the groove before trying the new board. IT WORKED!! Between the aggressive detune (half way from the widest part of the board to the bindings) and the 3* bevel I put on the edges he was able to ride the Capita and carve out some great turns.
So now I guess I'm glad Buckmans hadn't shipped the Vandal yet as I called just now and canceled the order.
At the end of the day even after slamming hard off a jump (on the Capita) he tells me on the way into the locker room that we can pitch his old board. Obviously I'm not throwing it away but I'm glad he is now into the new board.