you dont want to see anything over 210 on those trans...
i dont think the electronic gauges read correctly on the trans... my dashdaq was always around 25 degrees hotter than what i saw in my autometer gauge.. the autometer had a probe in the trans pan...
if you need to cool it down lower get yourself a 6.0L trans cooler and install it in place of your stocker... you can also get a secondary trans cooler to further help cool down the temps....
if you need any help let me know
-Raul