The Hurst AC motors will always be a major limiting factor on the VPI tables. I own a number of the Hurst motors from the 49mm series up to the 60mm T series and the one consistency is they all vibrate, some much worse than others (within the same series). It looks like VPI just changed from the 59mm series to the cheaper and smaller 49mm on some of their tables (Classic and Scout, possibly others).
I ditched my SAMA with the Hurst 5W 59mm series on my Scout table and replaced it with a 3 phase BLDC motor with a custom enclosure and controller. Best thing I ever did for this table. Zero burn on the belt, 33/45/78 RPM with the same pulley, reversible rotation for idler drive, lots of torque and the smoothest, quietest motor I've found for a turntable.
http://www.diyaudio.com/forums/analogue-source/288730-3-phase-bldc-motor-turntable-use.html
I ditched my SAMA with the Hurst 5W 59mm series on my Scout table and replaced it with a 3 phase BLDC motor with a custom enclosure and controller. Best thing I ever did for this table. Zero burn on the belt, 33/45/78 RPM with the same pulley, reversible rotation for idler drive, lots of torque and the smoothest, quietest motor I've found for a turntable.
http://www.diyaudio.com/forums/analogue-source/288730-3-phase-bldc-motor-turntable-use.html