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You'll probably have to give more info to get the best input.
What lens specifically?
Assuming that you're mounting using the lens mount, not the camera mount, your setup should be as balanced as possible on the ballhead. To do this place the bracket in the ballhead with the clamp loose and the ballhead tension loose. Slide the bracket, lens and camera to get it in the most balanced position.
If your tripod and ballhead are adequate for the gear your using and properly balanced, you should be able to have "minimal" shifting. There has been much debate in other threads whether or not a very slight shift is always present and I would say that it's impossible to have absolutely no shift. In my experience, the better the ballhead, the less the shift. The amount of shift is also determined by focal length. At 24 mm the shift is usually too small to notice, at 200 mm it is usually quite noticeable. The additional weight is also a factor.