Pipebro, try this. Now at the age of 66 I have noticed a bit of a roll-off in auditory reception, mostly in the upper range of frequencies and mainly in my left ear. Through simple experimentation I found that by pushing out my left ear, from behind and from the base of the ear, I had a marked improvement, particularly in high frequency reception. And fortunately, this aided not only in finer details but also in a better quality of imaging. So what I am doing now, when sitting in "the sweet spot" for serious music listening, is placing a small piece of closed cell foam directly behind my left hear, at the base of the ear and next to my skull. I use a makeup cleansing pad which is a soft foam material. I cut it in the shape of a crescent so it follows the shape of my ear. This pushes out my ear, slightly forward, about 1/8". It's so simple and yet quite effective. Maybe I am lucky and this minor adjustment is all that I need. It may or may not work for you. But since it is such a simple task and costs just a couple of dollars for a bag of 12 pads, then it certainly is something you should try. I hope that you find good results. FYI, these pads are available at Target, Wal Mart, and most drug stores. There are very soft ones and there are more firm ones. I found the more firm ones, which are a closed cell foam, keep their shape much better and don't compress flat.
Best to you. Be safe and be healthy.
Best to you. Be safe and be healthy.