Fortunately, the outside track of the arena seemed more or less ok, so off we went. Izzy was great. We could only do tiny little baby leg yields because there wasn't space to get off the rail, but she did a nice shoulder-in left and shoulder-fore right. I reminded myself (constantly) to sit up and keep a steady contact, and our transitions were actually pretty good. Funny how consistent contact makes things steadier all around, isn't it?
We're still having some right lead issues in the departure, but I think it's more my issue now. Izzy doesn't hesitate to take it, but she doesn't just give it to me. I have to stay in balance and ask correctly. No leaning forward. No awkward seat motions. No throwing away the reins.
All in all, it's good for me to have these problems because it makes me actually ride correctly. I tried to focus on keeping Izzy forward and ahead of my leg, and magically, everything else seemed to fall into place.
Now I'm am halfpad shopping... are all thinline half pads (with quilt/fleece) shimable? Anyone know?