I think the hysteria over food at the moment is not well founded/documented. I was worried in the beginning too, but I did not change (I did look around). I recently had both of our pups tested to see what kind of allergies & aversions they had & I am continuing w/the same companies you used but w/more limited proteins---in line w/the results we got on the testing.
You will see that Fromm has taurine in their kibble if you look at ingredients. I did try supplementing sardine & Kitzi had a huge allergic reaction & had to be rushed to the vet. He could hardly breathe. So be careful & if you try something do it during vet hours. We almost did not make it time wise.
I can't advise you on what kind of food to use---only speak for myself. There is a lot of hype out there---check out Dr. Dodds (Hemopet) on line---she is very balanced.
Qui me amat, amet et canem meum. (Who loves me will love my dog also.), - St. Bernard
"Life without a maltese is like summer without ice-cream." - St. Edelweiss
"Wag more Bark less"