Hi there Michelle and Diesel!!! So very glad you came out from hiding!
I would increase it a bit. Until he is an adult, then cut it back. I give my adults 3/4 c twice daily, my puppies (5 mos old) get 1.5 c twice daily. You can give him some healthy snacks inbetween as well. Fromm is not full of fillers so it seems that since he is maintaining his weight, I would not be concerned, but once he hits the age of 1, keep an eye on his weight. Once they gain it, it is not easy to get them to lose it once they reach adulthood.
Glad to hear you got off of Purina!!! Do you see a difference in his apperence? Share your story with us, we would love to hear about it!
Oh, and PICTURES PLZZZ lets see your baby boy!