I posted a new topic, in the hopes that Zero would see it. Regardless, the gist of what I said was that I haven't fixed it, but I found the issue. Basically any ability that takes effect either on-hit of an enemy, or on-hit on me FROM an enemy flashes my screen. So I can avoid it by removing those abilities.

I.e. Removing Bash if playing human or Evasion as a Night Elf.