FWIW, I never saw/heard a huge need to "fix" the HD800(S). The treble spike has never felt a big deal to me when paired with most tube amps and even some solid-state (BHA-1, etc).
You can't hate this headphone if you have the right 800 in the right system. Unit to unit variance is a thing. There's also a reason that people say you have to build a system around it.
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