Thanks all for your input.
I just pitched the yeast on today's batch using your advice. To set the record straight I have a 3 gal Rubbermaid drink cooler not an Igloo as I said in the OP. It is taller and thinner than the Igloo, so it creates a deep grain bed.
8 qts strike water 70*C = 65*C mash
60 min rest
sparge: 7 qts 80*C (4qt and 3qt addition)
output: 3.15 gal 1.055 gravity sweet wort
Added 3# DME during the boil and topped off in the fermenter to 5.5 gal
OG 1.054 5pts higher than anticpated.
I'm not sure I like the falsebottm and collection tube that it has. The false bottom is very heavy gauge plastic with very small holes and the dip tube doesn't reach to the bottom of the cooler. It would stop drawing and I had to fiddle with it to get it flowing again. It flowed very slow but I know the 100% wheat was largely to blame, Next time I will use rice hulls.