After running it @ 270 last night, I 2nd Tboner's min. flows. I've done it at 270 before and 380, but I had forgotten my book w/notes yesterday and didn't remember flows from previous runs. 380 was really fun and not any more difficult with the features taking on some personality. 270 is bump and grind.
PS - the tree is no big deal. There's no sneaks around it, but there's not snagglely branches if you were to miss the 5 bright yellow, obnoxious signs and blunder into it -- you'd just flip, drag on the bottom, and roll up on the other side (not that I would recommend that approach). BTW, it's clear that the tree was cut on purpose to have a bridge across the river -- not sure how I feel about that. It's large, 24"-30" diameter, if anyone knows any ambitious beavers. I guess they tried to make it safe by removing branches and installing signs...I don't know, I guess I'd just leave it and call it a chance to stretch your legs.