To the post above^ My 27 yo. Is on full pasture/stall as she pleases and keep steady weight and shine as well.
OP-Is he open to full pasture? I know for show horses a lot people like to keep them stalled, but for a million dollar shine, top of the line feed and hay doesn't always do it. They need that healthy organic grass as well.
I totally understand sun fade. My bay can fade to an ugly orange, but since I started feeding paprika, he doesn't sun fade anymore, and keeps his nice dark rich bay color, even on all day turnout in the heat of summer.
If he's already fed well, and kept groomed, then all I can really suggest would be some added supplements.
And Omega Horseshine are all respected coat supplements, to name a few.
"You're just as sane as I am."~Luna Lovegood.