UPDATE: I picked up the 1 piece drive shaft last night and put it in this morning.
#1:I already knew my carrier bearing was of the janky variety
#2:I noticed that the seal plate at the base of yolk that seals against the transmission was getting cut/grooved AT LEAST 1/8" and had slung black residue onto my transmission tunnel.
With my new drive shaft, I have ZERO VIBRATIONS, and it drives great. I'll post some pictures here in a minute.