@JohnAdams,
You have experienced fleeting tinnitus for a long time, it becoming shorter is the opposite of what I have experienced with healing. Although, in the very high frequencies, I have noticed some shorter occurrences; fleeting, fleeting tinnitus. I wonder in which register you are experiencing these sensations, and if they correlate to areas effected by damage and/or healing?
Every time I experience fleeting tinnitus, it correlates with a subtly improved perception of audible texture. Since this is obviously entirely subjective, do you notice any such correlation?