Sounds like to me you need some experienced Smith people on your permit with you. May I offer my services as experienced, but unable to pull my own permit. Just kidding we have another trip planned for that time, but you pulled a super permit. The good news is you should have good water and usually the fishing is superb at this time. I have a raft and personally although I'm a great person in a canoe - I would never canoe it. It can be done - I had friends who went with me 3 years ago who did it. It is hard for even expert canoe people and the real reason is that it is so busy. You never get to rest, fish, drink beer and enjoy the scenery. We carried a bunch of stuff in our raft so if they did go in the drink they had dry clothes and tent. This being essential on the Smith because it can snow any day of the year in there. It is a beautiful trip and I'm extremely jealous, but take my advise and leave the canoe at home and bring a raft.
If you lean over to watch the river slipping slowly away beneath you, you will suddenly know everything there is to be known. Winnie the Pooh