The place you want the cheek weld, is on the narrow portion, just behind the top cover. You want your head down, and your nose to, or alongside the top cover. This will give you a natural and proper sight alignment when the rifle is shouldered.
I will play with these parameters and see how they work, as long as they don't mess up my big bore Africa shooting techniques!!!
As far as shoulder jelly ... I am dubious as to how a 30/30 on power scale could do that??? An AK is NOT a power rifle by any means. Saying such messes with the folks who are recoil sensitive, when the AK is a very pleasant rifle to shoot.