I also buy from fullertons,
Not sure why someone would tell you they slip to much, or how they could even tell, all tires will slip in the sand but sand stars are 8 paddle with little extra cups, not enough traction is not a problem.
Sand stars are one of the best molded v blades out there, but to be honest your not going to see a big difference with any molded v blade, IMO sand skate1 are the best with skat trak edge being 2nd, but unless your into drag racing it doesn't matter, buy what's cheapest. I would recommend sticking with an 8" wheel.
Is sand lake has heavy wet sand I wouldn't use paddles, as I don't at pismo, your quad will be more fun to ride without them.
I'm not a paddle expert but I have tried a few different setup, 6-7-8 paddle haulers, gliders, extremes, sand stars, brats, sand skate 1, sharks, and edges. b2b, sls, reg buff, play cut, comp cut 20"-21"-22" 8-9-10" wheels and to be honest other then racing it really doesn't matter other then bounce and tire roll with the bigger tires.