Elzilch-O
I found this recipe to be a little strange for the flour>baking powder ratio with the amount of liquid, myself.The recipe seems like it would give you more of a consistency for mortar(I'll bet you could slap it between two bricks and start building)than batter..  Nate wrote earlier "however I had to add a lot more milk before it got the the consistency of pancake batter (it was extremely thick and unpourable before I did this)."
I recommend that you do away with the all -purpose flour and baking powder all together, and just use cake flour...again, you still might need a little more liquid, say another 1/4c. milk.