Well, I finally had a chance to get this dropped in and naturally (my luck) is if it could go wrong it did.
Started my mash at 157 and was about to grab an ice to throw in and drop that last degree and que hell..... So I threw the lid and a blanket on and off we went.
I finally get back after my 16 hr mash. With the extra 2lbs of pale and apparent efficiency (temp was still above 140) I've pretty much hit my beersmith targets. Drain off expecting to only need a couple gallons at best and low and behold my full boil kettle is punctured.....
So now I'm boiling in a 25qt and 20qt (bulk in the larger). I FWH'd the 25 (5.25~g) with half my starting charge figuring the small increase in ibu from that will make up for the slight disadvantage in boil size and since I have a second kettle running 2g or so and me figuring on very fermentable wort I threw in ~ 8-10oz of unspiced pumpkin puree I had handy to add a little body back and make up for the necessary dilution. I figure since I'm so far off the beaten path I might as well go all in.