Does anyone feed their puppy Blue Buffalo?

First time pit owner here. Started her on Purina Puppy Chow, but she wouldn’t eat it… I guess ’cause it’s junk… When I switched her I did the whole gradually introduce the new food thing and it worked great. I was giving her 1.25 cups twice a day which must have been too much because she was getting loose stool. Changed to .75 cups twice a day and her poo went back to normal, but I can tell she wants to eat more. Should I try 1 cup twice a day? What if that gives her loose stool too? Would .75 in the morning and .75 at night with a .25 or .5 for lunch keep her full better? Anybody have any feeding tips? I don’t want her to get fat. She looks great right now, lean and muscular, but I dont want her to be hungry all the time either. What and how do you feed your puppie/puppies and or dog/dogs?

Thanks!