The mechanics I'm referring to are in the 50+ page document that I read, that I'm sure most people (miners) are not even aware of: https://hackmd.io/@timbeiko/1559-updates/https%3A%2F%2Fhackm...
As for profitability changes, that's almost impossible to measure right now. There is too many variables. One is that there isn't any wallet support for 1559 yet (MM came out today and is apparently, um, lacking). People are still over paying for transactions. Difficulty + price changes + pool luck + changes in hardware stability also make things nearly impossible to track accurately. I have a margin of error, but it doesn't look too bad right now actually.