does reticle focus have any effect on parallax correction with an AO?
eg... if you reticle is not in focus, does your eye get confused when setting your range on the objective?
I'm not sure how all this works or relates to each other, but I find that at various reticle adjustments, there are various objective adjustments which correspond at various distances (does that make sense?). So I reckon 1st get your reticle focused for your eye, then focus the objective. There are many corresponding points of focus in this spectrum.