Another dog food question...canidae salmon grain free?

I've been searching for a dry dog food to fit both dogs (1 year old american bulldog roxy and 6 month old pit dax) I am currently on nutro ultra which is no good according to vast research on dog food asys and long hours on the floor of the surronding 25 miles of feed stores and pet specialty stores I've discovered the ingredients are not good and the food is over priced I want what's best for my dogs on a budget I can afford and meeting quality requirements I desire, that being said I've came to canidae grain free salmon dry dog food. I was wondering what you all think if anyone feeds it and do you think protien level is too high go to the canidae website and check it out. And if they're too high and I go ahead with it what cirstances do I face if its just energetic dogs that's fine but I've heard kidney problems and that's not ok. Also roxy has skin issues to name a few... yeast infections in her l area, between pads of feet in ears on stomoch under chin, also compat constipation and loose stool never regular bowels. And there's been more! These have decreased since switching to nutro ultra but I know they can be less if not gone. I have had her to plenty of vets they have mostly reccomended benedryl or some type of pill or special medicated diet, no thanks! I know that there's a food out there that can help her I just haven't found it. If anyone has had any real experience with this please lend your advice. I've never had such a 'sensitive' dog. Oh and no raw diet time consuming and don't have room to store enough meat to buy bulk