albert,
eye relief does not have to vary much in variables.
some have more of this than others.
the same issue appears in scopes used by f class shooters to a greater or lesser degree.
manufacturers just need to put a higher priority on design.
on lower powers there is more latitude in useable eye relief, and as powers increase the band gets narrower., as well as closer.
mostly you won't get hit in the head, but sometimes you have to shoot uphill from a less than optimum hold and then ouch.
there are scopes with longer eye relief, like 4", on max and min power, but you have to look for them.
a good scope cut makes you bleed like a stuck pig, and is a good step forward towards a flinch.
bruce.