Wow Beetlemania, you're my kind of audiophile. The few times I posted similar details, and the proper test engineering of listening and evaluating each set of changes, then ranking them, I've been met with crickets. As such, my post you're responding to was minimal.
I do have 0.1uF bypass Multicaps across all three ESAs, and my 13uF coax series is a 10uF || 3uF ESA. (These are in addition to the Lexington Elpacs I mentioned that remain in place) I'm sure there are all variety of better caps by now that improve on both CSA and ESA; that ship has sailed.
Fair point to replace the electrolytics due to loose tolerances and drift. I'll look into the coils and order the resistors. Thiel supplied me with the schematic for the HF XO, but don't have one for the LF XO, though it should be simple enough to figure out. Anyone who has that diagram I'd appreciate it in a PM.
Does anyone know about the changes to the 2.4 woofer that were apparently made after my speakers were manufactured?