My transmission seems to be slipping...torque converter??

All this started with1-2 and 2-3 flaring. Found the kickdown band loose. Tightened it back up and repaired the lever. That helped for a bit. Then began doing it again. The fluid smelled burnt. Dropped the pan found some debris. Cleaned it out put new fluid.in hoped for the best. Seemed ok for a bit then began slipping. I tore it down expecting find fried clutches or bands. They were not. The frictions measured about the same thickness as when they were installed. There was leakage when I did the air pressure test. I did replace the seals and tested again it was much better. I will drop the pan again and get the shift linkage centered in drive. I suppose at this point that seems like the most logical culprit. I really don't want to pull it out again but I'll do what I gotta do to make it right. Thank you for your help.