There is so much hype about dog food I find it incredible.
Unless there is a medical condition requiring it, most dogs will be fine on basic kibbles, with the odd mineral supplement if needed. We used to breed labs and they will eat things that will make a rat puke. Special dietary needs aside, I would try yours on a mid range kibble and see how your dog gets on. For the last few years ours (we only have 3 labs now) have been on a light food from Fressnapf, they go crazy for it, it's easy to get as they are pretty much everywhere (and they deliver) and doesn't break the bank either