Ok...I'll take a stab at this...
Are you sure that the vibration is due to the driveshaft angle? Are all your U-joints front and rear good? Motor mounts good? Transmission mount? Any other looseness in your drivetrain? If so, fix those problems first.
I'm not a big fan of TC drops. It's seems counterproductive to raise the Jeep for ground clearance, and then drop the TC to reduce ground clearance. I think of them as a temporary fix until an SYE can be installed. Unless, it's just a street rod or mall crawler, and you don't mind the lower ground clearance.
That being said, just buy some longer bolts and buy or make 3/4" spacers. There's no need to buy an expensive TC drop kit, IMO. Some pipe or tubing cut to the right length would work fine as a spacer. You might be able to find some 3/4" long pipe nipples. I've found that Tractor Supply has the best selection of bolts in my area. It won't cost much or take much time to try this fix...
A better solution over dropping the TC is a 1" body lift and 1" motor mount lift. This also gives you more clearance for your oil pan.
Even better is an SYE/new driveshaft.
The best (and most $$$) would be an SYE/new driveshaft with a 1" body lift and 1" motor mount lift.
My Ammo Can Console: http://www.jeepforum.com/forum/f12/yet-another-ammo-can-project-finished-1498520/
My 8.8 Swap: http://www.jeepforum.com/forum/f12/yet-another-ford-8-8-swap-extras-1565339/