Val, I can see that your horse is stiff. Her trot seems very stiff and short, but of course I dont' know what she is like normally.
I thought you rode her very well. Your posting is so solid that is looks like you are sitting the trot.
One thing I noticed was that you seem to be advancing your inside shoulder a bit more than seems correct. Or maybe collapsing it a little. Particularly when going right. It's really hard to see if that is just an illusion of the heavy clothing you are wearing or not.
Your hands were very nice and steady and the horse did really well in her transitions.
As for my posture, I think I'm somewhat crooked on right (so your observation was very correct). My stirrup there is longer (that's what both my trainers say), but it feels OK comparable to my other one, and yes, I do lean more that direction (doesn't collapse though, I specifically asked trainers). So I have to keep it in mind every time I ride to keep myself straight, I guess I was too focused on test! Lol!