Leaking issues in my 200 4R - any gurus available?

If it was a gasket or seal it would leak all the time, what you have stated it only leaks after driving and when it gets hot and no abnormal heat. Is this correct?
Some others have stated fluid level to high and I have not read an answer. I would set the fluid level to the add line (better to 1/2 qt. low to give fluid room to expand) possible cause fluid out vent tube.
Next have you tested to make sure the lock up is working in the torque converter. If it is not it can create a lot of heat when under load in overdrive causing fluid to expand.
One test you can do is keep it in 3rd gear and no overdrive and after setting correct fluid level take for a long road test and see if any leaks. let us know.