I have made a huge mistake.
Tinnitus returned last monday, and it's 100% my fault. I had a decently large genetics assignment to get through on the weekend, and I ate a large amount of chocolate (2x200g blocks I think) over the weekend to stay energized enough to power through it. T returned the next morning at full strength. No other snacks over the past month have made it increase this much, so I guess I got a little too overconfident.
I have no idea what the f my bodies issue with chocolate is, but it looks like if I want to remove T forever, I'm going to have to avoid chocolate for life (is that even living?).