OK I’ll give it a shot and I can put the raw files in a zip file if you want to grab them all to play with
Thanks but that's not necessary for me, although others might like to do so and I very much encourage anyone interested to try it. I mostly wanted to satisfy my own curiosity that the 3 microphone arrangement and stereo mix works in the complementary way I expect it should (both spatial-image-wise and complementary-frequency-balance-wise), even with the limited spacing between the omnis.
I know this test was only intended to serve as a general comparative test of the 4099 and the test configuration used was based on having only one 4099 available. I also recognize that your plan is not to actually use the microphones in this configuration, but to instead use a pair of 4099, either with or without the 4061 omni pair mixed with them.
However, there is a lot to be said for this 3 microphone arrangement. It gets a lot of things right: solidifying the spatial center with an upfront focus and presence across the mid and high frequencies reserved for the primary source of interest (direct sound from the stage/PA), while retaining good deep stereo width in the bass without things getting cluttered down there, and a nice open ambience from the omni mids and highs.
For all that to work well its very important to dial in the balance of the 4099 against the omnis accurately by ear. It can't be some formulaic 50:50 mix or whatever.
It is perhaps best described as an "improved HTRF recording technique" - HTRF recording technique meaning head-worn omnis placed along the temple region in front of the ears.