Did this trip about 10 years ago and used Papa Bears too. We did it in Sept and spread it over 10 days. I can honestly say that it was the best trip of my life. There were 3 of us unguided. The top half of the river was loaded with silvers, dollies, grayling. You could literally catch 200 silvers a day til you gave up. I would mainly start off on a pod by mousing before going down to get them. The 2nd half or lower river where you will start to encounter some native and lodge traffic is where all the big leopard bows were. The river was filled with log jams and under every log jam were giant bows gorging on the dead salmon that hung up on the root balls. Bring lots of flesh flies. We didnt see another angler or group until we got to the 50 mile or so mark except a boat load of natives going carabou hunting, They couldnt fit another person in the boat. They would pull ashore, one would get out and climb a hill and glass for the herd then come down and off they would go. They came back a couple days later with carabou hanging off that boat, I have no idea how it floated.
This is the trip to end them all. I would recommend doing it yourself so you could do the entire river and I know you can do it in 8 days but I would think about 10, problem with that is bringing fresh food. Youll have to plan that out pretty well. IM me if you want any more info. And pick an alternative river in case that is either blown out or too dry. I want to get back there.