I don't know if this will entirely be of help- but I know dealing with ulcers can be a huge struggle so I figured I would try my best to help!
Drifter was suffering from these really bad. It had never entered my mind to think about it because he was out 24/7 and had access to constant grass and hay and wasnt on a huge grain diet. But once he started losing weight last fall we scoped him, and there they were.
Drifter was also reactive at certain points of pressure. There is a video on youtube detailing them. I will try to find it for you.
We had to treat him with ulcer guard for 5 months and I had to get him on a digestive supplement after. I went with the Smartgut Ultra from SmartPak and have seen wonders with it.
I treat him with tums every once in a while. And I make sure to give him alfalfa before we ride. Alfalfa is the best thing for ulcers.
His current diet now is 3 grain meals a day (split up into smaller portions) with his SmartGut added to his dinner. He gets two flakes alfalfa at dinner. And 1 lb soaked alfalfa cubes with breakfast and lunch. He also is out 24/7. If he gets stressed for whatever reason (his triggers are hauling, wormer, stall, etc) he gets a maintenance dose of ulcerguard.
Before treatment he was very lethargic, off his food frequently, frequent colic and his coat was very dull. This is him today.. big difference! And he just keeps improving! no more ulcer.jpg
Good luck! And please feel free to message me with any questions :)