If your motor likes 35 degrees at low altitude, I'm not sure why you took timing out for Bonneville's higher altitude.
It looks like you are topped out on your timing slip... Something will need to be changed to go faster...
Shifting at 8000... through the traps at 8050... but with 35 degrees of timing runs well to 8800... did it stop pulling at 8000 at Bonneville in the lower gears? That may be due to reduced timing...
OK as I said first running Bonneville is an experiment.... I would try being ready to do that... Not sure I'd start with 5-6 inches in the rear... maybe 2-3 with the ability to go more, bring larger tires, try going back up in timing, especially if you are throwing in water.
Guys? feel free to jump in here...
Have fun...