At least in my case, I don't think that mapping is the culprit. When the lag occurs, there seems to be little difference if I'm at 30% or 80% throttle - it just doesn't go. In fact in a few cases, realizing that I was in this weird state of seeming suspended locomotion, I've stepped into it even more deeply and it did not noticeably respond. No - I've never floored it, because if it let loose, there would be way too much power.
2012 535ix Space Gray, Cinnamon, SAT, Premium, Prem sound, Cold W., Sunshades, Gloss Black Grille, Gloss Black Side Markers, RE970AS 245/45/19 non-run flats that run very smooth + quiet and also correct the otherwise optimistic speedo