How frequently are they exercised? That determines more about feeding needs than what classes they go in. My stud also does everything but drive - he is lunged for maybe and hour 2-3 times a week. I consider him a pasture puff. Yes, he's shown frequently, 5-6 times a year in rated shows plus a few small fairs etc, he's in shape, but not under huge demand requiring calories to burn by any means. Still a pasture puff in my book. Showmanship, halter, and trail in hand I don't consider all to physically demanding so long as he is in decent shape which a couple hours of lunging a week accomplishes. He maintains weight fine, is healthy, has a great coat, and isn't deficient in anything. Therefore, I call that a good feeding program.
The pony filly is growing, and worked a few times a week. She is in need of protein to grow and calories to burn. She gets blue seal brand extruded feed at 16% protein, 8% fat and good Timothy hay. No pot belly, good top line, not growing too fast - therefore I consider her feed fine. She runs around a lot more and is in need of the calories to grow and work - only reason she even gets grain.
What results do you exactly expect to see on your horses that would make you change your program? What isn't the omelene 200 doing? Do you have pictures? That would be a big help