THIS!
Mine used to range up to 210-215. I had it hotter once when I was in traffic for an hour trying to get out of Houston on a trip. I put a big B&M cooler on it and haven't been over 190 since. Typically I run 175 or so. That's been in 100+ degree weather since I added the cooler.
If the fluid is regularly getting that hot, you likely need to drop the pan and replace the fluid. If you are that far in I would recommend doing a Transgo shift kit. I did that and have been very pleased with the results.