I would rule out the Kadet sr. with a 91 FS and it's light weight it is not a good trainer, I know because I have flown that combination and it's a screamer.........
I think the Sr. Telemaster or the Bob Tharp Flying King might be better choices, the Telemaster is well behaved with a 91 FS and the Flying King is large enough from apperances to be up to the task.
Better yet do the Sr. Kadet with a new Magnum 46XLS that is on sale this weekend for $49.95.