Update: Max is down to 4 cups a day and his stools are nice and firm. I feed him 1 3/4 cups in the morning and hubby gives him a small 1/4 cup at lunch in his kong and then 1 3/4 cups at dinner and 1/4 cups just before bed. I found he'd throw up at 5:30 in the morning if I didn't feed something right before bed.
He's grown a bit over the past few days and he's really lean now. I can see the last 2 ribs and he's got a waist any woman would die for!
Thanks again for the advice!
I went out and bought another bag of Orijen. I'm also going to ween out any wheat in his diet, I don't think his stomach does well with wheat.