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I was not happy with my original design using the SB15NAC30-8 & the Airborne RT-5002 that I brought to Ankeny a few years back. After a few disappointing attempts revisiting the crossover design, I looked at what Craig had done with the Keramiskas. I had used the same type of LP filter and that part remains, with some major changes to some values. I now have these sounding good enough to call them keepers. I think it all came down to me wanting too much BSC in the early designs. These now sound very smooth and I think they finally do justice to that tweeter.
Quick measurement of the final design - gating was maybe a little too loose.