A couple of detail questions on your D40:
1) How thick is the saddle? My Corona D40's is fully 5/32" thick compared to the 3/32" on the two Westerlys. I'm wondering if it might be due to the thickness of the Dtar UST.
2) How would you describe the neck profile? My D40's neck is noticably thicker than the D25 even though they share the 1-11/16" nut spec. That brings playability rating down to "8" on mine.
I'd agree with the rest of your ratings as applied to my Corona except for "sustain" in which I'm a little dissappointed, I'd only give it a "7", but I'm probably spoiled by the archbacks of the other two. The D40 DOES beat them out on note definition though.