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
) 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.