to much malt extract imo. extracts have an inherent amount of unfermentable sugars. I would drop 3lbs of extract and replace with corn sugar if you really want the high grav. You might consider, .25 -.50lb honey malt, biscuit, munich, special B, or something else to add some depth of flavor.
I rarely pitch "enough" yeast anymore... make a starter if you want/have time, but i think it is a waste of 6.00 for another smack pack.