early on a saturday with a flow scheduled hike down the trail like you are hiking to the green race get to the river and hike up to go left and watch people run the thing and then you will have some insight.
OR take your boat and go paddle it with people who know the river like the back of their hand get to go left and get out to watch anyone else out there running behind you go through it.
ahhahahaahahah
ssorry could not resist when i saw this one
but hey that is what i would do or get out and look at the rapid and find your line.
just remember talking about a rapid in text is damn similar to dancing to explain architecture.
if you arent there some things just get lost in translation.