Well you have the right idea with using a buttload of rice hulls with wheat.
Do you fly or batch sparge?
When you open your valve on your MLT, do you open it all the way? or do you let it trickle out at first? If you open it too much and too fast, it can pack the grain down resulting in a stuck spage.
Next time, try stirring the mash a little more before you sparge, that might help the distribution of the wheat in the grain bed.
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