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I'd be completely comfortable with 220 F - 230 F transmission temperature. 300 F would be bad. 170 F wouldn't get rid of the crap that is in there, and so could be a transmission life reducer.
Best indication that the standard fluid temperature is too high or not is if the fluid is getting burnt. Haven't seen that, or heard much in the way of reports of burnt fluid on this transmission, using the standard cooler. That suggests to me that overheated fluid isn't a concern.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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