Could use a little help. I have a five year-old gelding that I have been working with for a few months. Great attitude, relatively quick learner (and a good teacher). Just had annual check up and no issues. Recently, he has started pawing after riding a few circles (either direction) at a slow trot. No protest when starting and none ever with ground work (both lunge line and liberty). I am a little concerned about the sweat at his whithers and him being sore there. I tried shimming the saddle a little and that helped some but still same pawing after a few circles. He’d go if I force him, but I suspect he is uncomfortable because he becomes a bit hot (nothing major) when I push. I have tried a smaller, lighter saddle and he did better with that - although I struggled.  

Other factors:

1. No change to riding location.

2. Is grazing more due to available grass (not enough to see weight change).

3. Temperature is ~20 degrees warmer when riding now.

Any recommendations? I have ordered a saddle pad with shims to adjust and am thinking a week of rest, even though I don’t see any signs of lameness/ soreness.