Check out viewtopic.php?f=3&t=10425
I haven't had any problems with mine. Over 5" of set back and the cavitation plate is 2" above the bottom of my boat. I've heard (don't hold me too this) that you can raise your cavitation plate above the bottom of your boat a 1/4" - 3/8" for every inch of set back as a general rule of thumb without low water intake.
Even with a low water intake, your going to have problems in a true 6" of water. I've had 3 boats with low water pick ups and hydraulic jackplates and couldn't run in a true 6" of water. I can push the boat you see in the link above and possibly get on plane using the pods in 12" of water. I normally just Idle or TM to deeper water. I've busted to many props and shafts. I also do not like sucking up all the mud and sand into my motor.