Depends on the type of driveshaft you are running. With that steep an angle, a CV shaft would work well. With tipping the pinion up, you need to account for the decrease in shaft angle as the pinion rise, see:
- http://www.4crawler.com/4x4/ForSale/Shims.shtml#FAQ1

So between 22 and 6 degrees is 16, less the 2 static is 14 as you noted. However, you'll see the shaft angle lessen 1 degree for every ~4 degrees of pinion up-tilt, so you are looking at maybe a 12 degree shim if going that way. Can make a 12 degree shim, it'll ne close to an inch thick in the center:
- http://www.4crawler.com/4x4/ForSale/Shims.shtml#Ordering

With that tall a shim, you might cut/re-weld the perches on, not sure how they are so far off now. Or was this the original perch, confusing as you mention welding on new perches and not wanting to cut off the old perches.

Or with a single cardan shaft, you may not need any shims, depending on the t-case flange angle.