Not Good Vibrations

Hey all I'm new here. About 3 months ago on my 2012 Prerunner, I had all 3 U joints replaced, as well as the carrier bearing. Also had the drive shaft balanced...twice. This mechanic normally does good work as he did on my 2008 but he was having a tough time in the middle of moving his shop so I gave him the benefit of the doubt.
Since then I've noticed a vibrating. Pretty sure it's not the tires. I had two of them replaced (by his suggestion) which were plugged previously. All four were balanced. The vibrating seems to happen now when I let off the gas, coasting down the highway at about 40mph the slowest speed which it happens, whereas before it was vibrating when I gassed it. Seems to be a slight jolt when I gas it again this time. Does the whole drive shaft need to be replaced? What do you guys think? Could it be a motor mount?
Thanks

 

Pretty sure it's not the front end either

 

Did this start with the work that was done to the Driveshaft?

 

Not long after. Within a few weeks.

 

Been under it and looked at the driveshaft..any play?

 

Gonna be hard to diagnose from here..need to let somebody drive it and narrow it down. Found this on TW
https://www.tacomaworld.com/threads/vibration-on-deceleration.699823/

 

Are the tires you replaced the same tread pattern as the other two?