What is missing is the description of location of the antennas ("EH just north
of existing"), their mutual positioning, location of the radial system, guy
wires, etc.

Judging from the pictures, they are quite close and there is most likely quite
a bit of coupling and the EH might be taking free ride off the full size
vertical. Also some "simplification" going from 150 ft tower to 90 ft tower
with all that stuff?

I bet I could get better performance with 90 ft tower loaded with coil, top hat
and elevated radials. Much simpler and cheaper and no E H mumbo-jumbo.

Safe to file it with CFA and Freaktals?

Yuri