I wonder if it is an insertion depth effect... in the literature that comes with the Final E tips they discuss this and provide some generic graphs to illustrate the effects. If I can remember to, I will check for a copyright mark, and if none will take a photo and post here.
That would be a good read. Post if you can. Cause in my head I'm thinking how can moving a nozzle 2mm actually make a difference. It could be that i'm getting a better seal and not aware of it?
Crinacle has very good points about burn ins -- on another note: just because we (including myself) claim that we experienced it.. did we really experience it? I mean as kids magicians fooled us into thinking something happened when it didn't ... maybe our brain is tricking our hearing ?