At one point I saw, somewhere on the ATT site, the Windsor Pro cap listed as 1.5mm of "blade exposure" (according to @Cal that should be "blade reveal") - which tracks with the posts referenced above and also with what I feel in use.Thank you, David.
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I'm sure you've seen this post as the ATT fellow was responding to your inquiry.
He doesn't totally answer the question, but his answer lets me know it's going to be trial and error. Unlike you, I don't have every available (at one time but not now) component, so I'll just do the best I can do.
There are other glowing reviews of the CM1 but which cap they used isn't always clear.
This gentleman says the Windsor Pro aluminum (which I suppose means the aluminum SB90) has a cap which is 1.7 mm whereas the SS SB90 is 1.5 mm. (I think that's what he's saying.)
To my way of thinking Above the Tie does a lousy job of marketing their products in that it's very hard with all their offerings to figure things out. Whether that hurts sales with other customers is beyond my pay grade, but it hurts sales with me.
Generally though they have very good gear in my limited experience.
From what I've read, they plan to greatly expand their Windsor Pro line to include OC, slants, etc.
Like some others I'm not wild about their made-in-China policy but I understand it.
Happy shaves,
Jim
The Aluminum is still a bit of a mystery to me. I'm taking today for my Vector (still my favorite razor) but then plan to spend more time with the Aluminum Windsor Pro plus CH1, CR1 and CM1 plates.