Fair enough your dogs are looking good on it, but why add more protein with meat, when you are feeding 28% protein.
I received info on feeding gain from the rep, for my working whippet, who said to feed Gain 28% on its own.
if adding raw meat which i was planning, to feed Gain 20% with a supplement.
Could try keeping a sack of both 20 and 28%,I do this with the red mills and make a mix,of varying amounts depending on how much exercise/work the dogs have had,also feed meat,carcass,tins of fish etc,dogs look ok on it