I would rather worry about notching the frame and oil pan clearance to gain uptravel..... than stressing about more down travel, U-joint binding, and shaft slip length.
I really don't want to come off like an ass, I'm always up for a good debate and learning stuff, so I will say this.
My transfer case is clocked and transmission is pushed up, so my T-case output is higher than most (not all I know). I'm running a regular 1350, or maybe it's 3R, CV joint. The slip is maybe an 8" slip, I dunno, it's nothing fancy and no blue wear coating. Front shocks are 14" travel, ORD 52" springs with axle moved up ~2". I don't have any problems. No CV binding, shock travel is good, and DS shaft travel is good. I don't know why all the need for droop. If you are running huge tires, and stuffing them into the fenders, it doesn't seem right to limit up travel, relocate shocks for more down travel, and then have issues with all that mess. I normally don't find myself wishing I had more droop, I wish I had more tuck.
Sometimes, the more droop you have, the more vertical the body gets, the closer you are to flopping over. I suppose that's more of an issue for down hill and flat obstacles.