Very interesting thread.
That bike should leave in second no problems, dumping the clutch or feathering it out....it has enough motor, compression and is ported. Should be a rocket...something very simple is not right.
Travis...on our tracks, as Shayne said, more PSI is more spin. I've see other posts where guys said more PSI makes the blade stiffer and flex/fold less. Our tracks (all three of them) tell us otherwise, based on time slips and 60fts.
Dunes...however, is a different story. Not groomed, deeper and finer sand, no clay/dirt mixed in. Sometimes you have to put more pressure in the tires to dig down past the fluffy stuff...
I usually start with 6-8PSI in my tires and drop them down till my 60 foot times come around....and 90% of the time I'll end up with 2.0 to 4.0 PSI.
Now....when Ionia was rained out and it was muddy/thick soup, I ended up with about 8 to 9 PSI because it hooked so hard, even the big motor bikes would just bog out of the whole, no matter how much you slipped the clutch out.