Hmmm...
For me... I would move the scope and rear ring forward as much as possible.
I try to set the eyepiece as close to the back of the rear of the receiver as I can. In your case, that may be a challenge, but you do have some room to move the scope forward until the turret base contacts the front ring. Then reposition the rear mount ring just forward of the scope's power adjustment ring.
Your eye will thank you....
I have a long length of pull and shoulder the stock with my cheek well forward. A standard A2 stock for me is too short. My method of mounting may not be suitable for you.
If the scope is mounted correctly...when you shoulder the weapon with your eyes closed..then open you eyes...the scope image should be sharp with a full image all the way to the eyepiece edges, lacking any black shadow or dark "doughnut"... Not every scope will allow this on an AR upper and each shooter will shoulder the weapon differently. But that is what your trying to achieve.
Just my $.02...
Kerry