Quoted:
Surprised that nobody chimed in on an actual "technical" question.
I read your post yesterday and really I didn't know how to respond.
Typically people mount their scopes or red/green dots so that the cross hairs/dots are above the front sight post.
To me it is a matter of comfort, if a scope is too low it hurts my neck, so I like mine higher. Originally I had mine on a 0.83 in riser and I liked the feel
even though I had little cheek weld. But, I didn't like the way it looked. I finally found a 0.5 in riser that I like the look of and it puts the
dot just above the FSP.
So, as you said much of this depends on the users tastes and comfort.
As for POA/POI, I've found when you change riser height you have to re-zero of course, and thay doesn't change trajectory, meaning that your 50/200
won't be affected.
Sorry, not very technical, but I hope this helps.