Some current thoughts are a "dished" seat, more like the RS seat, some sort of rearset, and maybe lower bars.
Also wondering about things like advancing the timing, etc.
Please let me know your thoughts.
The dished seat and lower bars would help your torso act less like a sail as you go down the strip.
You might consider a small bikini fairing to clean up the aero a little.
You mentioned rearsets. In the action shot you posted, what is supporting your left foot? It appears to be too high for the stock pilot peg and not far enough back to be on the passenger peg.
The 400 likes to spin, so let it: VM30s would be a good start, and you can give them large-ish main jets for strip use. Not sure what sort of exhaust is on there now - appears to be stock headers and aftermarket mufflers - but what goes in must come out so you'll need to pay attention to that too.
Years ago when I took my (non-stock) Super Beetle to the strip, I took the end cap off the SuperTrapp muffler. In theory I could have put it back on...
Basically I'm suggesting mufflers that have a removable baffle or something you can take out while at the strip and then put back in to ride home.
Also think about gearing. Not sure what your sprocket tooth counts are, but going a tooth smaller on the front and/or 2-3 teeth larger on the rear will help it pull harder but at the expense of higher highway RPM.