Have you considered an opening which sits above the dome and occludes the surround? The guide we made for the T-Labs tweeters performs exceptionally well that way. Not a hint of top octave wiggles.
I had tried that with the 3" Tangband dome and it had a pretty bad impact on the response. I've found that others *usually* have the same issue, so I didn't do it here. I'll make a part though and see for the heck of it. I'm going to do another batch with various tweaks to tease out what is doing what and where. And a few phase shield tweaks.
Did you try any versions of that with the throat outside the surround? How deep is that? Good looking speaker, bet they sound great!
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