I don't get your question - you have a rear SYE already, right, so the rear shaft isn't stock in the first place. And are you saying that the aluminum rear housing of your t'case is cracking, or appears about to do so?
If I were starting over, which I'm not, I'd do a JB super-short SYE instead of the non-JB SS-SYE I have now, as JP appears to have a few good engineering touches for theirs that others lack. For the shaft, I'd stick with the locally-built heavy-duty rear shaft that cost less than Tom Woods and was made by people I know who have a shop 10 minutes from my house. I'm sure Mr. Woods makes a good shaft, but I can't see the point in paying someone in another state to make something and ship it to me when I can do the same thing down the street for the same price or less.