That's about where my transmission was going in the summer, like you said once you start to sit in traffic or go up a mountain it can start to climb and I was seeing 210 at times.
I changed from stock Dex III fluid to dex IV and drove it that way for a few weeks and it seemed temps generally got 5-10 degrees cooler
Since I got my Overkill Tune though, I havnt see it go over 200 a single time... I dont think it's been over 190 in fact.
I know it has something to do with the cooling fans running full time at a certain coolant temp, but I think the operating parameters in the tune have something to do with it too.