the hand held tuner allow Randy to tune it for you. It just requires you to datalog what hapens when your driving, email that file to randy, download the new tune to yuor handheld and load that to the car. repeat until dialed in.
Now, the trans cooler isa good call, but Id also suggest an upgraded valve body. With the hand held tuner, Randy can also change shift points and pressure to make the trans last as long as possible.