What a great thread! Having owned my IS a little over two months now, I am noticing that it is a lot happier in either full auto with sport on, or manual mode with or without sport mode. When you refer to dtc off and completely off, what do you mean? One press of a button it is off, I am not aware of any secondary deactivation.. I may be wrong.
2014 F25 X3 M-Sport Carbon Black, Technology/Premium/Winter/Driver Assistance
2011 e92 335is DCT - Cobb, ETS IC, AFE DCI, BMW PS kit, M3 control arms, various cosmetic improvements RETIRED!
2007 X3 RETIRED!
2006 e90 330i 132k miles RETIRED!