Just my $.02 but over the years, seems if you get the rear focus correct on the cross-hairs, the parallax and image focus seems to all fall into place as you would want it too. Took me a while to figure that one out but has seemed to work for me ever since I've started working it that way.
Focus the cross-hairs via the rear ocular then try parallax reduction to the point it's at it's minimal. If the whole image isn't in focus, go back and refocus the the rear cross-hairs again.
Focus the cross-hairs via the rear ocular then try parallax reduction to the point it's at it's minimal. If the whole image isn't in focus, go back and refocus the the rear cross-hairs again.