After several months of experimenting with crossover mods, finished - Maybe. High quality caps, resistors, and air core inductors. Also swapped in a GR Research M165 driver. Very pleased with the sound quality. Clean, detailed, and smooth to my ears. Did a near field measurement in my listening room with UMIK-1 and REW software.
Mic at 0.5m, 5mS window, 1/6 octave smoothing, no EQ. Think have reached the point of diminishing returns? Close enough to smooth out with EQ? Thoughts?