Mineral oil is what is used in my power supply to prevent discharging between the capacitors and diodes. So I figured that if I immersed the saucer device in mineral oil and it still moved, then I've eliminated ion wind. It did move, although very slowly. It had only a short arc within which to move. If started in the middle of the tank then higher the voltage is needed to get movement.
Low voltage is needed for movement.
Since it only had a short distance to go, this slow movement was normal. I wish I had a large enough vacuum chamber. This lead me to conclude that the effect is not ion wind. The saucer device detailed above always moved in the same direction, irregardless of the polarity. The fastest that I ever got two of them spinning around the tower was 60 complete revolutions per minute.