I don't think it's in your head. In theory, as you twist the single strand, the grain of the wire twists tighter. It compacts, shortens, and probably expands the diameter of the wire. You probably end up with a shorter and slightly wider wire than you originally started with. The wider the diameter, the more surface area the wire has. The more surface area creates more vapors because there is more heated wire in contact with the juice as it vaporizes. Of course, I'll have to try this and mike the wire before and after twisting to confirm this. But none the less, you are changing the dynamics, conductivity/resistance, and structure of the wire when you twist it. It only make sense that you might notice a change in the way it vapes. The only thing I have to say is, "If it's safe, and works for you, then DO IT!"