Hi guys, I haven't contributed to this thread in a long time but these Panasonic headphones remain one of my favorites.
What I'd like to suggest to you is to try a smart EQ. What I mean by smart is something which does some of the work for you. If, for example, you own a Samsung Galaxy phone, they have in the Sound menu what's called Adapt Sound. I have an S6 and I don't know what other models have it, or if they put in in other series, or if they changed the name in the meantime. I also have a Samsung tablet, Tab 2 I think, and that has it as well. What it does is play some tones, I think it is a 10 band EQ, and asks you when is the threshold of your hearing. It does it for both ears, independently - you may be surprised to find that your ears are different. To me, the improvements are quite radical. I tried to educate myself, my hearing, a bit more and, for example, to hear the shoutiness some hear with these headphones and now I do. My own pads and the fact that I can play with them helped with these exercises. But, after applying the EQ the shoutiness is gone and everything comes so much more into the picture. Of course the phone does not have the best amplification, and unfortunately the EQ settings are only available on the headphone output, and not digitally. Also, only testing your hearing at that low level limit is really just a beginning, but it is a very, very good start.
Enjoy!