I've just tuned by mash/lauter tun by cleaning the manifold and installing a new PVC valve. I've called the manufacturer who claims that with the PSI I'll be using, there shouldn't be any problems related to heat. Now the recipe, assuming 70% efficiency.
6lbs. 2-row Pale
.5 British Crystal 50-60L
.5 American Crystal 80L
1lb Caravienne
.25 Special Roast
1 oz. Challenger 6.5% AA @ 60
.5 oz Challenger @ 15
Yeast: White Labs British Ale, The real UK-05??

Dry hopped w/56g EKG for 7 days.
O.G 1.037
F.G 1.009
ABV 3.6%