But all moving-mirror cameras enjoy problems like that - the bigger the format the worse the problem. The only solution would be to eliminate or, at least, attempt to reduce the kinetic energy that is the slap reaction and that could only be done by slowing down the raising action. So, if you fancy 1 sec. + exposures only...
But look at it this way: if you use a camera whose tripod hole is pretty well centrally mounted below the mirror box, a tripod whose plate holds the camera directly above that central column, then the slapping action would have to be attempting to lift the entire camera upwards and as it can't do that when using a solid, rigid, high-mass tripod ŕ la original Gitzos, there should be no movement possible. The same solution should solve fp shutter bounce in some cameras, just as long as they have vertical running shutters and are not turned on their sides... all in all, Compur-type dynamics must be better. Sort of makes me think of attempting to lift one's self by tugging the shoelaces; you sure won't create upward movement, but you might still fall over. As with cameras, you can't win.