The ring to base fit can be tight, but when you take off the rings it is no tighter than it was. I have some bases on which I can slide the rings on and others require a bit more persuasion, but never more than a gentle tapping with a piece of scrap wood.
Base crossbolt recommended torque is 30 in pounds and ring screws 20 in pounds so you are in the ballpark.
As to your question about signature zee inserts, please read this and see if it helps. It explains it better and faster than I.
http://www.burrisoptics.com/pdf/Sig_rings.pdf
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