I have purchased the Dexron VI and the trans filter. I ordered the shift kit from ZZP and are awaiting its arival. I tried the Seafoam Trans Tune and it only prolonged the time during an actual drive before the hard shifting returned. (It used to hard shift in about 5 min, now it is around 10min.)
I will install the shift kit as soon as it arrives and report my results from there.
Thanks again for all of your help!