Depends. There are alternative instructions for highly active dogs. For 71-90 lb. dogs, the Preference box says for active dogs to give 1 c. mix:1.5 c. water + 2 c. meat.
My dog lost weight on their recommended portion, so we feed more. It's just a matter of feeding the dog and its individual metabolism. We experimented to find the right portion size that works best for him to maintain.
FWIW, I mix up a huge Rubbermaid bowl of base mix (about 5 c. of dry to about 8 c. of water), and I leave it in the fridge for up to 3 days. He gets about two cups of prepared mix daily, about two and a half c. of beef, and he's smaller than your dog (70# and lean). Sometimes his meat mix has some organ meat and ground bone in it, sometimes it's just muscle meat. That's what works for my dog. YMMV.
Consider adding some Glandex too. It will help the anal glands a lot. You can add it right into the base mix at meal time, stir it up and let it sit a few minutes to activate the enzymes.