Transmission help

Sounds like possibly a front band problem. If it's adjusted correctly it could be the servo is leaking. Did you do your air pressure checks along the way? I always do to ensure things are sealing properly. If it is a front band servo problem it wouldn't be a hard problem to fix. Drop the pan and valve body. Air test the servo first to see if it's working with about 20-25 lbs. of air pressure. If it sounds like it's leaking alot you've got a bad seal. Or if the band don't move the seal is bad.
I attached a pix to show where the test ports are in case you don't know. Hopefully it comes out.

727 Air test ports.jpg