Based on the pic in post #1105, it looks like you're running the factory bushings in your shifter. I would highly recommend the Function First Shift Right Soln that upgrades the bushings to solid aluminum, which eliminates 90% of the slop. And it's not an expensive upgrade. I've had it on my CSS for 2 yrs and I'm much more confident of my 5-4 downshifts now.
Here's their website:
FUNCTION-FIRST > Products
Here's an article on P-9 when they first came out with the Soln, along with some installation hints:
https://www.planet-9.com/987-cayman-and-boxster-chat/116466-cup-car-shifter-teardown-shift-right-solution-upgrade.html
BE SURE TO WEAR EYE PROTECTION WHEN REMOVING THE OLD BUSHING TABS. Those suckers fly off with some velocity.