That midrange coloration (bass hump too) also does my head in and all their redeeming factors just disappear. I can tolerate many flaws in my headphones but only those where the headphone leaves something out and doesn't make up for it my adding some nonsense to the music, hence my preference of the HE60 over the HE90, SR-Lambda over the L-Pro's, SR-3 over the SR-3 New and it goes on and on.
A small change in how the diaphragm was tensioned is more then enough to account for these differences in sound. Other factors such as the glue used also apply but the tension is a large part of the sound.
The Wide PC-OCC cable is always the same, despite the color. The new LE cable is the first advancement in that area in 16 years.