stuamurr is, for all practical purposes, right on the money. You could bump up the "Maximum player disparity before movement suggestion is made" so that a movement suggestion won't be made until your tables get really out-of-balance, but that still won't guarantee anything. Ultimately, even though the player disparity limit may not be reached, the software will notice that the players can fit at 2 tables instead of 3 and will suggest that you move some players.