Ugh. I have swapped cables & tested at great lengths and I have determined that the 'a' axis dual axis card is the cause of the servo vibration . I also might have damaged the new servo drive. I hope I didn't break anything else.
Oh, the control reads the rotab's rotation as 1/2 the actual rotation as I expected. When the table turns 180 degress the control shows 360 degrees.
I guess we'll see what's next tomorrow.