I aggree with what you are saying about the jerky shifts after a fluid change but this was still jerky after weeks of daily driving. the 2-3 upshift and the 2-1 downshift. That is why I changed the solenoid pack. After a few days the jerky shift came back and then I decided one last try to swap the fluid. This whole process was over a few months of researching the issues and trying different solutions. Once the fluid was changed the shifts were smooth and 45,000mi later they are still smooth.