Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
Welcome to my forum.
Here you will find more than 6 years of questions and my answers. It is searchable and offers a great deal of information.
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All the best,
Dr. Getty
Hi Kristina,
You're wise to not over feed grain, especially if he is already prone toward storing fat. The first thing I would add to the diet is a good B Complex preparation. I recommend B Plex. This will help him derive energy from his feed and give him more energy to do work.
Since he's holding his weight well, give him more hay so that he doesn't run out. If he goes for hours without anything to graze on, it can actually make him fatter due to the body's tendency to slow down the metabolic rate.
All the best,
Dr. Getty 
Where are you from? Bayfield, CO