Nobody has mentioned the Kirkland Performance food (purple bag) from Costo.  It has 26% protein.  I don't have any gas problems and both of my dogs have coats like velvet.  I was pretty surprised myself at the results and my dogs like it.  Sometimes I will mix it with the Chef Michael Roasted Chicken from the store for a little variety.  It has dehydrated chicken pieces and veggies. 

I'm ready to switch from Candidae. I like it okay but it makes their stools a terrible yellow and they stink. Seems to be alot of poop in the yard too. Also wanted to get something cheaper since I now have two big mouths to feed. But then I got hooked on Taste of the Wild-high prarie. TOTW is even more expensive! I am able to feed less of it of course since it is so high quality in content.

But I was thinking of cutting in something cheaper to stretch a bag. Costco/Kirkland is actually highly recommended according to the analysis website dogfoodanalysis.com.

Is it silly to mix expensive with cheap together or should I just get one mediocre middle bag, something like Eukanuba or ProPlan?

I am also thinking of switching Wyatt's food, he is 4 months  and 27 lbs and on diamond puppy, he really does not LOVE his food, his gas is BAD.

My question is do I still need puppy food? I am thinking of switching to TOTW.

I would keep him on a quality puppy food til he is at least 10 months, but definitely not switching any earlier than 8 months.  If you want to change foods to another puppy food,  do it very gradually over a couple weeks by mixing small amounts of the new food with the old and increasing the amount of new vs old over that period.  I would also use the new food as the training treats instead of a more fatty treat.  Just a thought.  I've never had a gassy dog.

Again, mine are on Kirklands and I only give them about 3 cups each a day.  Minimal poops as well.