Back focusing issues
If your lens is still under warranty, I would recommend that you send your lens in for authorized service, along with the camera body that it will be used with. That way, the technicians can check both items to ensure the best set-up for your lens.
I have done this with a DA* 16-50 lens sent to the Canadian authorized repair depot and they set everything up for free under warranty.
I would also recommend that if you are adjusting any lens yourself, do so as a custom adjustment to that lens only, not a general adjustment.
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