Nothin' there to apologize about. Sounds like we're all pretty much on the same page, and I like your description of the effect of the dwell time issue.
It all makes good sense, and just as you say, 12v into a coil without the internal resistor is hard on the coil, both in terms of performane and durability. I'd just add I think it's hard on the points and the condenser, too. The points are nothing but a switch and are, in theory indifferent as to what the voltage is (at least within the reasonable range for the size of the contacts and the gap, but the condenser especially is designed to absorb the shock on the primary circuit when the field collapses, and that shock is a lot heavier when the coil is "overcharged" leading to burned points and smoked condensers.
So pick the part that would be more apt to fail, I just would advise against running 12v into a coil that wasn't built to step it down to 6.
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