Sounds like you need to adjust your diopter. You may have done this already but this is the way I go about it. I will set up at a known 200yd range and set my parallex to the same. Then i'll fiddle with my diopter to get a clear focus of the target. After I do this I don't touch the diopter again unless my eyesight changes. Then adjust your parallex for focus & parallex free shooting. I've never had a problem doing it this way.
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