Tony,
I'm sorry to be rushing off to work, as this is really interesting -- it's fun to see the options laid out this way. My short answer is, naturally: whatever works.
All stresses aren't equal, and other factors come into play, such as using words of different origins (i.e., Anglo Saxon and French) that tend to roll off the tongue differently. Some poets may (sometimes) find these differences enough. For me, though, I find I like to break up a line now and then -- maybe too much -- when it starts to feel like I'm a metro gnome. Crowding two stresses together at the beginning or the end of a line, or a headless iamb after a caesura, are particularly temptations. But these aren't the thoughts of someone who is a technical master, or a scholar: just the thoughts of someone who's interested, and glad to listen in on the discussion.
Best,
Ed
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