Well, I finally found the perfect scope mounting solution for optimal cheek weld and eye relief on an AR... YHM 6" riser with Vortex Low 30mm Tactical rings. This puts the center-line of the optic right at 1.25" above the rail surface, which is almost identical to the sight height of the A1 and A2 rifles. It gives me absolutely perfect cheek weld, and the 6" long riser lets me get the combo far enough forward for proper eye relief when shooting NTCH.
This setup did bring up some issues though. For one, it is low enough that the front sight post on a fixed FSB rifle obscures the center of the scope's FOV, even on 4x. This was never an issue with higher-mounted optics. It has caused me to switch out my fixed FSB for a YHM folding FSB on my A4.
For another thing, this mounting method puts the scope too low to clear either a KAC 2-600 or Magpul MBUS rear sight when flip-up scope caps are installed. This has caused me to do a little prioritizing and remove the rear sight on my scoped ARs. I can carry a zeroed rear sight in my gear; and if my glass goes TU in the field, I can pretty quickly remove it and screw on the rear sight to get back in business. I figure maximum functionality with the primary optic is a lot more important than long-shot scenarios in which the optic breaks and I have enough time to loosen and remove scope rings and flip up a rear sight, but not enough time to remove scope rings and install a rear sight using a screwdriver.
Here is what my riser+rings setup looks like, installed on my recce.

"This motto may adorn their tombs
(Let tyrants come and view):
We rather seek these silent rooms
Than live as slaves to you."
Lemuel Haynes, 1775
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