The sort of testing you outlined above is good to do, a real eye opener.
Have a look at this page where Troels' outlines his measurement technique which is similar to what I do. You'll see at the bottom how much difference the flush mounting makes. Your baffle for the tweeter is quite wide and as it's a ribbon I guess you'll have crossed at 4Khz or so, by the time the baffle edge become a problem you may have crossed. An interesting point to note is that looking at the scan speak illuminator tweeters, and taking just the tweeters that have a silk dome, they are identical tweeters except for the roll surround and the faceplate. Take a look at the responses for them all, all wildly different, that's just down to how the wavefront interacts with the surround and the faceplate.
If you look at the measurement of larger drivers, you'll see peaks and dips starting at the frequency that is determined by the wavelength as the wavefront is diffracted at the surround, your illuminator probably about 1.2khz.
A lot of speakers do have some sort of edge treatment like round overs and facets, of course the cost of those boxes and especially the veneering of them goes up loads. My own speakers have got large 30cm diameter vacuum formed ply sides that wrap from front to back and have no illumination.
Basically every bit of the box makes a difference in measurement, all about compromises 😀
Various press reports saying there are fears of a second coo attempt.
Also stories of British troops and evacuation transport being readied for the estimated 50,000 Brits in Turkey if things get ugly.
I also saw a report of dozens of children being arrested for treason as well.
Bit of a thread resurrection I know but there was a half page ad from Wallace Sacks in The Observer on Sunday offering an "Eames Inspired Lounge Chair and Ottoman" for £474. Being a fool for a bargain I nearly jumped straight in before I decided to check out some reviews first. http://www.reviewcentre.com/reviews182325.html
The total comes to £9.50 inc postage (probably send them separately to avoid the jewel case breaking).
My emails from last time see to be missing. Can't remember how you paid last time. Was is a gift payment or bank transfer?
Will also need your postal address again.