One thing I neglected to mention regarding the alignment of the Type W driveline. Since the driveshaft centerline is the reference point, anytime you change the angle of the differential and/or the transmission, the drive shaft angle will change too.
So, after an adjustment, you must re-level the driveshaft by raising or lowering the frame from either end. Then take your measurements again. It's a little tedious, but not all that hard.
Also, you don't have to re-level the driveshaft, you can just do the math and calculate the angles as a displacement from the drive shaft centerline. But you gotta do one or the other!
Point is, you have to recheck everything after an adjustment and keep tweaking it until it's right.