I havent seen anyone ask if the caliper bleeder screw is on top and not the bottom. When putting the calipers back on sometimes  I've had people bring me their cars after "doing the brakes" and they installed the calipers left on the right side and right side on the left side, hence-the bleeder screw is now at the bottom. Another thing too, the porporting valve may have "scooted over" a little. An old timer tech once showed me this trick. Make sure the front bleeders are closed, then open one or both of the rear bleeders, stomp the brake pedal quickly, close the bleeders and then try and bleed the front normally again. What that does is center the valve again. My