I would make sure that you’re running genuine licensed Chrysler ATF+4 Fluid and not universal fluid.
Chrysler is very strict on their spec licensing as ATF+4 is more grabby than other fluids like Merc and Dex. Using other fluids will cause a significant amount of slippage. Fresh ATF+4 straight out of the bottle smells like vomit unfortunately.
These are the only licened replacements for original fluid:
Advance Auto Parts ATF+4