If you are trying to center the cross hairs,,run each adjustment all the way to it's limit (doesn't matter one way or the other).
I think you have done this all ready.

Now reverse EACH adj and go all the way to the end of it's limit the other way,,,AND count the 'clicks' when doing this.

Then go back the other way once again with each adj...BUT only go HALF the number of clicks it took above.


That should get the Xhairs just about centered.