So far everything points to the shift solenoid A being bad, I picked up some replacements that ohm'd out good so hopefully this will do the trick.
I also increased my pressures manually since I had the VB out, sadly the trans fluid was pretty dirty and did have some debris in the pan.
Looks like this winter I may have to send out the trans to get built instead of a motor.
Also no-one appears to stock the pan gasket I need so I'm updating this instead of testing the new solenoids.