I'm by no means an expert here, but "hotness" is the word I usually see used to describe fusel alcohols. Maybe you just have a high alcohol belly warming beer and not fusel alcohols. I can't really say.
If it is fusel alcohol, it will not age away. Once present, that stuff stays. (Again, this is all based on what I have read... no personal experience with it.)
Ground Fault Brewing Co.