Deep sand is different. Dunes and sand washes in the desert require a different riding style to keep the front end light. Don't even think of going to the dunes without a paddle tire. A paddle makes a huge difference in being able to get to speed and on top of the sand rather than pushing through it.
Turning is done with the rear wheel and the power on. Get all of your braking down before leaning into the turn and then get back on the gas as you start the turn. Commit to the turn by keeping the power on and do not let off. If the power is chopped off the front will dive in and plow which likely leads to a crash.
Braking should be done using only the rear brake and engine compression to keep the front from digging in.
Lastly put one size larger main jet in. Sand takes a lot of HP and you will be hard on the throttle like no where else.
Once you get a feel for these techniques the dunes are a blast. I don't care too much for Pismo, too salty and everything corrodes quickly. Glamis is 'the' dune place, it's huge, but only in late fall to early spring otherwise too hot.