I've heard of some people adding about 1 lb of base malt to account for very low efficiency with BIAB. However, if I do a very fine crush I get 75% or a little better with BIAB. Therefore I don't really think that's necessary.
As a side note, I have this recipe in primary right now. I can't wait to taste it!
Next Up - Zombie Dust Clone maybe?
Primary - MysticMead's Irish Red Ale
In Bottles - Deception Cream Stout, Denny Conn's Boubon Vanilla Porter, English IPA
In Kegs - COMING SOON!!!