Well I'll put in my $0.02
1: Nominally yes on the round rear receivers. The older flat rear receivers had similar problems that you describe having with the Remmy's due to the flat being hand ground.
2: Normally yes. There are bad ones that you here about leaving the factory, but nominally and normally yes they are pretty centered.
3: No. The only exception may be the 14/114 series. They have a nice polish to them but I don't think its enough to throw off the receiver normally.
With my new builds I have been trying to use Burris Sig Zee rings and use the different sized inserts if needed to correct any misalignment issues. Seems to work great for me, and I know many others swear by them which is one reason why I tried them in the first place. Just some food for thought.
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