I wouldn't have changed anything except for I DID Change. My hearing that is. As my hearing diminishes, it doesn't seem to be at a linear rate at all frequencies. Odd but true. My ears, I won them.
I have said all of this to tell you that I am going to class D amplification, and possibly horn speakers. The biggest reason is that class D has punch. Same with the speakers. I am guessing that it may relate to what extra kick is related to this hearing change.