Yup, too much air pressure leads to hopping in the sand, whether it's a deuce or a pickup. Read the dash plate, it gives good suggestions for tire pressures. I run the fronts a little higher than the rears, but you need to get them down from road pressure, so that you can see the sidewall deform some.
Is your deuce on 9's or 11's?? (I see it's singled... nice!!)
C