you left out the tcc part in your post, i know jack about transmissions especially fwd trans, how it works what sensors do what, most i ever did to a trans was a pan drop and filter, or removal and replacement of one, i dont go inside them either, i leave that to people who KNOW what they are doing
your description sounds just like what is going on with the car now.
its getting scanned tomorrow, so we'll know for sure whats wrong with it.
is this one of them things a shift kit can fix? or tuning the line pressure up?
or could a clogged filter cause this? as its needs a service but the truth is im scared to drop the pan, the fluid is in bad shape.