Trans vibration or no?

Good point.

Water pump is good, about 4 months old, maybe 600 miles on it. Replaced fan clutch about 3 months ago. Might switch back to the old one on hand to see if it makes a difference. Need to check the balancer (pretty sure its at least partially spun since the timing mark doesn't line up anymore).

What's the best way to check on the balancer/dampner?

"Balancer" There is a clue in that word. :D