No I am not familiar with Minox and Steiner because both of those companies do not make a benchrest scope. I just buy and sell BR stuff. As far as the Weaver T36 vs the 36XR, besides me two of my friends that I shoot against have both bought 3 between them. All three of us think that the side focus parallax adjustment XR is a superior scope in every way over the T36. Don't know if the glass and the coatings are the same or not, but I'm pretty sure the objective lens is smaller in the XR than the T36. I've put both side by side and I prefer the optics on the XR.You familiar with Minox and Steiner? They both make very high end scopes.
Regarding the Weaver XR's I've read a lot of feedback that AO focus control is superior to side focus. And isn't the glass the same as the Classic T's?
BTW- Is Jenny's phone number still the same?
Since your research has you looking at gear catered to long range/ tactical optics, I have to ask what is your selected build requirements for the rifle?