Shadow,
Now keep in mind, I do have this scope on a .270, more of a hunting rifle, but I do like to use it for some long range shooting for fun. (I reload, that's how I can afford that, hehe) But anyway, the bottom line is I"m on using it it situations where there is shot after shot semi-auto fire.
I looked at the ATN website at the 3-9X55 LN. It lists an eye relieve of 90mm, which comes to 3.54, my simmons has relief of 3.5. A little of that you do seem to lose with the illum. reticle I believe. For SOME reason I have no idea.
Basically, it lists our two scopes about the same for eye relief. I've never seemed to have a problem with mine, I did have to mount mine a little forward because of the scope objective getting close to the barrel, but still, I've never found it unreasonable.
The eye relief at the higher levels is more or less more "touchy", but not unusable by any means,. Almost always, well, actually always, the higher the power, the less eye relief you will have.
Now let me get something clear here. You are having problems with eye relief, not parallax right?? Parallax is when you can see the reticle move on an object, when you are looking directly through the scope and you see rings and a strange blurred picture. Like you aren't looking "through" the object. This problem occurs at greater regularity with higher power scopes. Are you sure this is not your culprit? It can be very frustrating as you lose the picture very easily with just the slight movement of your head. Do you have an adjustable objective?? This help combat that. Maybe playing around with your existing scope could make it work? Move it forward or backwards to where it is comfortable and clear.
Hope this helps, just write if you need anything else.
Gundraw