It sure sounds like the fluid was never topped off and the TQ converter is trying to fill up, going around a curve and it quits like that sure seems like it was low .
I am not a tech here so just give our bunch of good folks time to chime in .
it should be easy to confirm, just check it fully warmed up, in neutral, on a level surface. Check it multiple times, making sure you have legible, consistent readings (front and back on dipstick).
Have you got correct setting on kick down adjustment?
