It's good to hear that it looks like my crossovers are working correctly- I'll stop sweating that now.
I was raised mainly on digital and I've spent the last ten years with various ribbons and, most recently, electrostats, so I think I've developed an affinity for a hot high end. So, I'll plan to grab a couple of .47uF caps and give them a try in the circuit at C1 to see if that works better for me.