So I see paddle tires ranging everywhere from the 27" EFX sand slingers up to the 30" skats being used on the XP1ks. What is a good size as far as minimizing bottoming out the frame/skid plates?

Ive been running 27" sand slingers and they have been a good paddle but I think they are a little small. I find myself bottoming out quite a bit if i get too aggressive in the dunes.

Long story short I guess im deciding between upgrading to the 28" STU or the 30" skat. Will going up to a 30" tire reduce bottoming out any more than the 28" STU or will I max out my stock suspension before then?