A firmly-attached tom on a properly-positioned rail mount that has been correctly torqued at all of the adjustment points will sway when the drum is struck. The amount of sway is no more intense than what is experienced with any other type of tom mount. The sway is much less disconcerting than the wobble incurred from a tom that is suspended from a floor stand. I suggest that you inspect the receiver on the tom to see if the receiver's mounting plate and the bolts or rivets for the bayonet mount receiver are not wobbling. I would also inspect and correct any slippage on the connection points on the bass drum receiver mounted to the bass drum shell, rail to bass drum receiver plate mount, the riser arm to rail mount, the tilter mechanism to the riser arm, and the spade to tilter connection.