So.... another helpful and good ride today with Cindy. :) She is so smart. :)
We were working on the canter to walks and she pointed out that I'm going from canter to halt, not canter to walk. It's a seat aid to a different gait, not stopping it altogether. Aha!!
The sad thing is... I know that. I've been told that before. Doh! But it did help. :)