That's crazy dct cars really have that much more of an issue. Sounds like it would've been more worthwhile to get a dedicated trans cooler... again no data is being provided of trans temps... what does "coolant temps in check" mean? Any logs to share?
I had my 135i out to lime rock park again recently in 86f weather and with mhd track coolant setting my oil peaked 262f... coolant peaked 216f? On the straight away...
http://datazap.me/u/banks334/lime-rock-stage-2-ots-86f
Compare to log posted above... different tunes but close enough.