I have three horses, a paint, Arabian, and a newly added Percheron. I feed one bale a day and my bales are 50+ lbs. Also the Percheron gets 4 lbs grain and the other guys get 2 lbs each once a day. My paint is the only one who gets worked (lightly) regularly. Ill attach some photos and you guys can be the judge if I need to kick it up.
I feel like if hay prices weren't so high, I would be feeding more.