Joannie and I first ran this 20 mile section of river about 20 years ago in a commercial sized raft with some friends. Thankfully one of our group knew what he was doing (a former rafting guide) because I sure as hell didn't. That run turned into a long day replete with forest fires and fire fighting helicopters.
Packrafting it in 5 hours this time proved to be exceptionally fun even though we still don't know what the hell we're doing. For those that want to know, flows were about 500-600 cfm and I wouldn't want to do it much lower.