I consistently got 65% efficiency with my BIAB set-up. Make sure you are stirring the grains well after adding them, when you add the grains to the water rather than water to the grains doughballs form that remain pretty dry through the whole process unless you break them up.
Primary: Apfelwein, Raspberry Lambic, Experimental Wheat cider, IPA
Keg 1: Hefe
Keg 2: Irish Stout
Keg 3: Peach Kolsch
Keg 4: Empty
Bottled: Bourbon Vanilla Porter, Chocolate Stout