John, I'm currently running the 4MD-20X in my Dual 1229Q, which is hooked up to my Lafayette LR5000 4-channel receiver. For set up, I use the Dual alignment tool and I make sure that the azimuth is correct which is facilitated by using one of those mirror alignment tools. Tracking force is set to 1.75g according to JVCs specifications. I don't recommend trying to adjust the VTA on a cartridge with a Shibata stylus simply because the engineers who designed the cartridge determined what was best for the performance of the CD-4 specs. If the cartridge is installed correctly, the VTA should be right, IMO. An interesting note about the Dual 1229Q: The table is nearly 45 years old (maybe a little more, I bought it used) and after I adjusted tracking force I checked it with my digital tracking force scale and discovered that the tonearm scale was within 0.002g! Man, you gotta love German engineering of that era! For CD-4 adjustments, follow the demodulator manual, if you have it, otherwise The Quadfather has given excellent tips in this thread. One final thing, if you bought the cartridge used, I think it's a good idea to try to get a couple of replacement styli, they won't be cheap, but they are getting harder and harder to find.
Yes, I have two quad systems set up in my house. The Dual and Lafayette are in the room I exercise in and they get used 2-3 times a week. I am running 4 Polk Audio tower speakers in there. It sounds pretty good, but the Sansui/Technics/Focal gear in my main listening room is amazingly good.