What to Feed?

First post yay! Haha
Ok so I have an 8 yo buckskin quarter horse gelding named Bono. He has chronic stomach ulcers despite multiple treatments (they flare up at shows or change in weather) because he's a stress puppy. With the advice of our vet we stopped feeding him grain. He currently eats 2 flakes alfalfa and 3 flakes coastal twice a day. My problem is, is despite a weight supplement he's dropped 200 pounds (I've also started riding twice as much). We've tried upping his hay, but he just wastes it or shoves it through the stall to my mare(lol).
So I'm wondering what suggestions for a "grain-free" feed would you recommend?
We are a true all-around horse. He is currently in hunter and western pleasure training being ridden 3-5 times a week for 1-3 hrs depending on the lesson and how fast we learn etc. He is also turned out daily for 5-6 hrs a day weather permitting with fresh grass. He doesn't get hot with extra-calories or a high energy food, in fact he's less grumpy with the extra "kick".
I just need something to help maintain him where he's at. Any advice would be great. :]
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He needs 1.5 to 2% of his body weight in feed per day. You will need to weight the hay. I recommend slow feed hay bags, it will keep him occupied and he can't waste the hay.Its also good for ulcers. Another thing I suggest is a complete feed, this will balance any nutrition he may be lacking. You may need to give extra feed, because he is a working horse.. I also like soaked beet pulp, to add a few extra pounds. Its high in fiber. Also a free choice mineral/salt block.
Everyone will have a different answer for you

I was thinking triple crown complete formula which is beet pulp based, but he's a picky eater so idk if he would eat it. And he has a small hole hay net, he's just awful lol. He also has a salt block, or had one. He gets salt in his supplements because he would literally tear off chunks of the block and completely soak his stall.
He's one of those impossible horses lol
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You could try mixing it first with his favorite goodies, at first mine don't like beet pulp, but once they get a taste for it they can't wait to have it.
How does he soak his stall with a salt block?

He would eat so much salt that he would drink extra and what goes it goes out. Ever since we reduced his salt intake by putting it in his supplements he stopped stall-wetting
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He needs to have as much salt as he wants, same as water. You really shouldn't control that. Free choice salt and fresh water. Because he is working he will need more salt.
If he is in poor body condition he shouldn't be worked at all, until his weight is back up. Excercise yes, but not ridden. You will never get his weight up.
Being 200 pounds under weight is a big concern, I would concentrate on his feed intake 1st, riding and showing second, when he is in good condition.

My app drenches his stall where I have to rebed it everyday. I never deny him salt as he is an extremely hard keeper. He gets 2lbs rice bran 5lbs beet pulp 5lbs soaked alfalfa/oat cubes vitamin supplement plus free choice timothy hay. He is a pasture ornament currently. Needs to be retrained but that will hAve to wait till spring grass comes in.
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Also he is extremely prone to ulcers and founder.
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When I say 200 pounds it was "show fat" we bulked him up majorly for the Buckskin world show for his halter classes. He has a mineral block during his turnout.
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I don't give grain to my horses, so whatever you gave in grain before you can replace with soaked beet pulp, rice bran, cubes, ect. Then if he looses weight add more, or vice versa.