The rods you have listed would be good choices for the Naknek River.
My experience with the Naknek River in August is that most of the fishing is for Silver Salmon. I found Silvers to respond well to streamers stripped back from the shore. My wife had good success with lead head jigs worked back from the shore. I was able to get a couple of silvers on the swing with spey rods on, I think it is Big River which comes in just below rapids camp.
In addition to your spey rods, I would bring a single hand 8 wt for the silvers.
Any fishing for Rainbows will either be nymphing with egg patterns or swinging with type 3 and type 6 tips.
I would check with the guide/lodge/friends who you will be fishing with and see what they are suggesting for species to target and setups.
FFF MCI and THCI
RL Winston Rod Co. Pro Staff