Let's say the slot is 12 ft wide and you are on plane. From the other direction, there is another boat going for the same 12 ft. What are you going to do?

So, in other words, just because you can doesn't mean you should. Once there is only one slot, your choices are pretty limited. Even coming off plane could mean you hang up. I think much below 2000cfs you get to the one line issue and in some parts of the river you get there before 2000cfs.

Similar issues occur just to be able to safely pass another boat.

Other than that, there are some good tips on these two links.
What Happens When You Hit?
\'What Happens When you Hit" part 2