Just a thought, but if the other driver still has the original cone, and this one has been reconed (poorly) with an accordion edged cone - from looking at the photos, why not have it reconed with the correct half-roll surround cone, you'll be able to fix the multicell orientation and the two drivers will then be much closer together in measured performance, well at least Fs.. The older style cones are on eBay from time to time, if not maybe GPA could help with a source