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The effects of age on HF drivers in general can be tough and for these JBLs which often saw pro audio duty it is particularly difficult to find examples that are still up to spec, and finding a matched pair is even tougher.
In the early 2000s I was experimenting with a similar system to yours. I had factory rebuilt 2441s (yes, they used to do that :banghead:) and carefully rebuilt 2405s above 2202s and dual 2235Hs in a 4355 variant. They were impressive at high SPLs, but I never loved them at more reasonable levels and while I like the sound of the 2397, controlling that wide dispersion was problematic for me.
I think I understand what you are saying. I never was able to control it. And as a result there is certain disconnect and incoherence in the transition. That, and also the issue with a 2405 combined with 2441 transition. When they are far time aligned, there is no hope of phase alignment at crossover. And even when time aligned, it was still not smooth enough. I am expecting the D2430K solve that problem with dual diaphragm.
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Going the M2 clone route is probably your best bet. The parts are all available new... not cheap, but based on my experience with JBL, if you don't buy them while they are available, you may be very disappointed in six months when they go on the NLA list.
Widget
great advise. I am still doing my research. plan is to try the STX825 first. see if I can work with the frequency variation. Then try the M2 one. Then I can decide which one to go with. I also learned a bit about the cabinet building and I think if I do decide to go with one of the two, I can build a new cabinet that will integrate the 2216ND1 and the horn into one neat package. Might end up with a 4367 clone, or M2 clone.