I lasted about half a day in the FB group (which again, only focuses on taurine and not the whole problem). They encouraged everyone to use Royal Canin and said that by-products and corn are perfectly fine. I just found another group that encouraged Eukanuba and Bil-Jac... Saying that boutique foods are just a hype etc. Now, I do wish that websites like dogfoodadvisor would be way more concerned about the whole issue with their recommendations (and that's my main issue with dog food specialty stores as well - acting like it's not a big deal), but I definitely do believe that reading the ingredients of a dog food is important - and yes, I learned that from people who studied canine nutrition. Lots of people on that group switched to Purina Pro-plan too - but there were a bunch of cases that were fed that as well (although I can't remember if the cases were low taurine or actually had DCM - that group put both in the same boat). I mean, I understand that DCM is scary, but there's more to health than just worrying about taurine too...
I looked into Farmina but my local store doesn't sell it and it's just really expensive to feed a large dog (let alone 3 dogs).