Do the symptoms occur when running MHD S1 instead of the 1+?
You didn't mention having an upgraded intercooler, which is encouraged for S1+. My 2009 with auto trans was not happy with the 1+ until after I installed an aftermarket IC, but now I can beat on it like a red headed step child with no codes...
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1and1
135i - E82.N54 2009 BSM - MHD / xHP / DCI, PR CP & 7.5" Race IC / N55 mid & Borla
. . WL RSFI, Koni, Eibach & Dinan CP's, M3 CA's / EBC Red's & Firehawk 500's
X1 - E84.N20 2013 MGM - JB4 - The Wife's, now with new turbo & ewg
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