Where are you getting the replacement earpads?
When you say that the headphones have great clarity or very analytical and still sound very musical is for me is key factor I look for in a headphone. I particularly do not like midbass muddiness. I look at the headphone cumulative Spectral decay gives me more information on the clarity of the headphone what I can correlate with my headphones and with the headphones I have listen to at RMAF.
Second is comfort. If you do not get a good fit with the headphone it will get more attention to itself the longer you wear it.
Third is the frequency response as long it is fairly neutral with small dips or peaks in the crucial frequency range it is usually not a big concern. All the concert halls that I go to do not have flat frequency response. Not all performances of the same pieces sound the same. Not all recording engineers will record in the same way. I am not really sure what a “perfect” frequency response in a headphone will sound since we do not have perfectly shape ears which will change the frequency response but more important do we have that “perfect” recording?
Fourth is the soundstage. It seems that a lot of emphasis is place on this. For me I rather hear the soundstage that is in the recordings, nothing added or subtracted. I have heard live concerts and recordings of the same piece which helps me to have a point of reference. I have recordings that sound like it was recorded in an anechoic test chamber. Recordings made by “look at me” engineers that used too many microphones with too many connections and recording on too many tracks will destroy the recording of the natural acoustical sound of the hall. If I had a recording that needs some help with a bigger soundstage for that particular piece of music I use my J.River playback software and use the DSD studio and use the headphone plugin and select the crossfeed option with the standard, increase spatialization option which helps on some recordings. That can work better than trying to find a headphone in the collection that can add something extra to the soundstage especially if the pervious headphone has great clarity.