Cooking oil dissolves most glues I encounter that soapy water won't. Rub some oil on with your hands then clean the oil off with soapy water. It's better than putting harsh chemical solvents (e.g. gasoline) on bottles you're going to drink from!
Rouge Porter labels used to drive me crazy...
This is going to be my next brew, it sounds awesome. All my calculations agree with your numbers assuming a 75% efficiency. I didn't see any posts regarding mash thickness however. I usually use 1.33qt/lb. Do you have any words of experience regarding mash thickness for this particular brew?