After I was done turning out, I tried a little clicker work with Miranda. Breathe reminded me that it is possible to do clicker without food, provided you know what the reward is that the horse wants. With Miranda, the reward is clearly for you to move away - to get out of her space. So I tried this a bit. I would hold my cupped hands out (I was wearing gloves) and invite her to sniff them over the paddock fence. If she did this with ears up, I clicked my tongue and took a step backwards. If she pinned, I moved her away. She seemed to get the idea pretty quickly that ears up got the reward. We did it in a couple of sets, and by the end the ears were pretty consistently staying up. This may have some promise as a training method to use with her.
Based on my looking into NSC values (see the prior post on this), I'm going to recommend that we stop using oats, since all but one of the horses getting them now are either senior or have metabolic issues. Without the oats, and getting less Purina Senior, Fritz is doing much better. He calmly eats his hay, and there is only a moment of weaving right before I feed his grain. He does a little stall circling before turnout, but nowhere as much as he was doing. And his manure is much more normal - not very loose like it was. I think his system was just overwhelmed by the sugars and starches. I'm also going to call the various manufacturers of senior and high-fat horse feeds to get NSC values for them, so I can evaluate if we need to change any of our other feeds.