Hiya craft, after being diagnosed gluten-intolerant, our Collie now eats Burgess Supa Sensitive, which is hypoallergenic etc. It's a complete dry food which we add a little hot water to. Sorry to be graphic, but his poo is firm and easy to handle (told you it'd be explicit!), and his coat is lovely and shiny and in good condition.
He does get the odd helping of 'human food' too; it adds variety, and it's carefully portion-controlled so he gets a doggy amount!
I have heard good things about Burns and James Wellbeloved. I used to use an organisation which sounds a little like the Trophy franchise; it was called Oscars, and made gluten-free pet treats. x