I rode him out with Kristen on Sif. She needed to work on her horse leaving another horse on a trail ride and her horse being left by another horse on a trail ride, so we got a lot of trotting and cantering in, as well as waiting around while she went away, during which Leo got to eat some nice prairie grass.
In our forays away, we addressed right lead canter, which is a little harder for him, so he tends to ignore the aid for it as if he doesn’t hear. Probably a fitness thing. It works to put him in haunches in, or one could think to remember to use the outside leg to hold the haunches steady. Attention to keeping the outside seat bone back also helps.