You need to weigh your scoop of grain. It sounds like he is t getting anywhere near enough safe choice. The recommended rate is .75-1lb per 100lbs for a performance horse with moderate exercise(let's pretend that is what he needs to gain weight). So if he needs to weigh 900-1000 lbs + (depending on how thick he is built) he needs 8-10lbs of safe choice a day. My 3qt scoop weighed about 2.5lbs for the safe choice. So two full scoops twice a day or 4 scoops split between three feedings.
That said- none of my horses ever did real well on the safe choice. And my stallion particularly in summer, and really not being anything more than a light performance horse, often needed LOTS of calories and a fat supplement to look good. I think he was able to maintain on 4lbs of triple crown complete during the winter, but we had to up it to 12 lbs(obviously split up into 3 meals) and fat supplements. He wasn't a horrible worrier, but was not anything like keeping a mare or a gelding.
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