You should have somewhat of a small gap. Heres a picture of mine, when I cycle the suspension it moves just about an inch, mine is almost long too at 19".
Agreed. DS looks too long if that is ride height. Put the angle finder on the ds tube, then put it on one of the 2 flats on the back of the diff pumpkin.
DS should have some spline travel to allow for suspension movement.
Quadratech doesn't make drive shafts. Tom Wood, Adam's, or your local guy will ask you to take some measurements and will cut a driveshaft that will fit.
Tom wood’s shafts are custom length. You send him a length and he sends you a driveshaft. From what I can tell, that driveshaft has legitimately no travel left for the suspension to compress. Driving that Jeep at almost any speed is asking for damage to the transfer case and possibly the whole driveline. I wouldn’t risk driving anywhere right now.