First: Nice video. I liked the surf in Sledgehammer. A little nit pick, what you identifies as Wall Slammer is actually the Narrows. Where the Funicular train come down is the Fish Bowl and that leads directly into the Wallslammer.
Backing up a bit. I've run the Gorge above 3000 cfs over 25 times with over 100 gorge runs. I wrote the Gorge page for AW American Whitewater - 11. Parkdale Launch to Canon City, Arkansas Colorado, US
unfortunately some one "fixed" it. I'm still trying to repair the damage. I also paddle the run with Ed Hansen who easily has 50 high water runs. He did Parkdale through the Gorge on Tuesday at 3900. So, we really know the run.
My high water run is 4700cfs last week. I put up a video in 2008 of our 4200cfs run
There are only three rapids to truly consider at high Flows. Sunshine, Sledgehammer and the Narrows. Sunshine definitely starts to get a bit smoother over 3500 the V wave and the lateral past it just seem a bit more straight forward. I have to work a lot more to stay on the line I want at 34,3500. At 4700cfs I was able to enter in the center.Sledgehammer gets easier for sure. At 4700 it was very simple, get center and ride the big waves. The narrows is tough for me to judge. I got flipped in the same spot just above the descent into the Fish Bowl both times during otherwise clean runs. It was bigger at 4700 but it didn't feel harder. Some other stuff gets bigger, higher and couple of things wash out.
Please come back at 3500 and try for yourself. It may still come back this year.
My film at 4700 is unwatchable. I was quite upset. Maybe next year.