I know nothing about this, but if you have slightly above average hearing, maybe that's part of the problem? Have you tried weak earplugs (like loops or etymotic or flare or whatever)?
They sure seem to be marketing in your direction. No idea how well they work though.
It's mainly about frequencies, essentially I can hear as if I were still 10 years younger. Sadly not the solution ;)
But thanks, and I'll say loops are amazing for the price for concerts.