Thanks for your reply.
I'm also concerned about remembered pain and am seriousluy considering trying him in a hackamore for a little while - get out of his mouth for a while. Quite severe dental work: His teeth were atrocious to say the least. His canines were extremely long and had to be shortened a heck of a lot. This is only the second time I've had an Equine dentist out, vet recommended her after he tried floating my rescue mares teeth. I live in the sticks with limited access to people like Equine dentists, chiros, etc. I took a look in his mouth this am, cannot see anything obvious. The pelham is a new sweet iron one I had made in a slightly wider size especially for him, his old one touched his lips, this one has a litle space to spare.
The bump on his elbow doesn't seem to bother him or be painfull, he had a run-in with one of my other geldings, he came to me as an adult, wasn't born on the farm so doesnt neccesarily respect "uncle Hans". Some of my mares foaled 3-4 weeks ago and are coning into heat again, so the two older bous are naturally in each others hair. I try to keep them seperated and give each a few mares, but one of our workers left a gate open and Kroon and crew escaped.
The only other thing after much thinking and internet research I can think of is maybe a dust type allergy or flies/ midges going up his nose, he snorted quite violently during our trail ride last thursday, it is unseasonably hot and dust here in the Northern Cape at the moment and flies and company are everywhere.