I'd thought Kahlua was more milky? I'll have to pick up a tiny bottle of that, too, and have a comparison taste test.

Your flaming coffee sounds like a production to see. Lotta work, but... dang.

Having cruised the internet a bit more, seems that many alcohols will flame... 80 proof being, perhaps, the lower cutoff. Though it sounds like for most you have to warm the booze in advance to get a vapor above the surface, which is perhaps more trouble than I want to go to, so it's probably a good thing I have 151... Hum. More experimentation is called for.