Actually, I'd think you'd want the top wing to stall first for a more gentle stall. Having the bottom wing stall first, unless you are flying a staggerwing, would make the plane snappy.

As for drag, that's a bipe's middle name. The cabane and the interplane struts add tons of drag and this isn't even counting the two wings. Some of the race bipes had a center pylon and streamlined struts, but you are still never going to approach a clean monoplane.

The usual bipe set-up is the top wing at 2-3 degrees positive, the bottom at zero and the stab at plus 1-2 degrees.