Okay, took the YJ by the shop yesterday and the owner put an angle finder to it. He said everything was almost dead on and, he didn't recommend shimming at this point.
The guy who checked it does quite a bit of work on race cars, and he seemed very knowledgable on drive shafts and angles b/c he has to customize drive shafts all the time. He didn't even charge me anything to look at it.
I think he said it was 85 degrees at the transfer case and 83.5 degrees at the rear axle, and he explained how those angles cancel each other out which the article talked about.
I didn't feel any vibrations either driving over there, so hopefully my U joint holds up. So, for now, I will just leave things be and if I have to put a shim under there, I am fairly certain 2 degrees would be the most I want to use. Thanks all for your help.