After a several months, I would like to report that the pleather of the dekoni pads does soften up, along with the foam, which ultimately leaves the sound fairly similar so the stock pads, with a touch more bass. They are more comfortable, though, and the felt on them is useful.
I have started experimenting with methods of taming the treble (other than EQ), and found that a single ply of toilet paper put between the pad's felt (there is no such felt on the stock pads) and the felt on the inside of the cups helps dramatically reduce the peak, at the cost of attenuating the 6k region too much (only a dB or so). It also leaves about 2 dB of the peak. This mod (if you want to call it that) is extremely easy to do and undo if you want. all you need is a pair of pads with felt on the inside and a scissors for cutting the toilet paper into a circle.