I use the larger wood 'table from AS. Near as I can tell, the motor has not moved a mm since I set it up. However, this is a much larger motor than the smaller wood model you own. I can tell you from experience with an outboard motor on a Transrotor Sirius- that I also own- that a level surface is critical to proper performance. For a whle, the motor was set back from the table on a surface that was app 3 degrees sloped. Speed consistency was a complete mess. I don't know that you need a base, but try to make sure that the motor and 'table are at least on a flat surface.
Good Luck,
Marty
Good Luck,
Marty