I have had been having great results with whole oats and Platinum Performance. I found that the Hoffman's wasn't enough for my horse, and when I switched, he flourished. He looks great and feels even better! However.........when looking at a feeding program, you also must look at the hay you are feeding. It may even be beneficial to look into getting it analyzed so that you know exactly what you are dealing with.
If you have feeding questions, pm Redzed. He has a ton of knowledge when it comes to feed (just don't tell him I said that or his head will swell