Hi Mike,
I am using Circuit lab. I have no Idea how to feed the program FR data from the drivers or if it is even possible. I basically listened to them and adjusted the value of R2. I simulated the voltage transfer function of the HP section and tried to correlate what I was hearing at different values to what I was seeing in the plots. I got to a point where I thought the voice range sounded right but the treble was too depressed. I adjusted the voltage transfer to follow the curve I was getting at the preferred value of R2 but changed values to get less attenuation over 5K. The good news is I was able to scrounge the parts I was missing from a local buddy so I built the junkboxmods version linked below. Just finished about an hour ago and my initial impression is that it did what I wanted it to do. So far so good, not sure what potential impact the change in phase response would be but imaging is fantastic. Feel free to play with these schematics on the site. I’ve saved private versions. One note, the resistors in series with the coils are the copper resistance of the coil not a separate component.

https://www.circuitlab.com/circuit/s...5-junkboxmods/
https://www.circuitlab.com/circuit/2kkt7h/a15hppublic/