I also see the wobbling, but when i test it, it happens with every KW part I used. Stock rocket with KW engine or fuel tank immeadiately wobbles on the launch pad but is fine in the atmosphere. The wobble also seems to increase with the amount of KW parts and as soon as I use any sidemounted engines not even the launch stabilizers can stop the wobbling. With the sidemounts the wobble also persists when in air and makes the rocket absolutely unflyable. I really love this pack, but sadly it is unusable for me this way.