Thank you guys so very much! I've read everything and will come back to it tomorrow with a notepad (when I'm not sitting ready for bed)
I talked with my BO who is starting him on a grain program twice daily, starting tomorrow. I will research what feeds are around here that match suggestions here and find a proper mix :) He will Lao be getting a blood panel done when the vet is out next just to rule that out.
Teeth were done in August, saddle is custom made to him and being refitted next week. I've had him on a 5 day per week program (trying my damnedest for that to be correct work!!!) for some time now and he just isn't where I want him to be. His coat is dull and he's just very dull, personality-wise.
Thank you all for the suggestions, know I am taking it all in and trying to do right by my horse :)
Working with our trainer and the horses at the barn, I really don't think(in my opinion!), that it's a feeding issue. Feeding complimentary meals is never a bad idea, and it is you will find out quickly to correct it. If you're riding him correctly(not saying you are not!) 5 days a week, he should (like you said) be getting more muscle than he is. Inappropriate feeding or lacking of certain nutrients, would reflect with more signs that the way he looks right now.
I think you would benefit more from working more closely with our trainer and getting help that way, to try to modify what you're doing with him.
A athlete on protein shakes will gain nothing unless they have the proper gym program to go with it. Same pertains to this.