Any tricks to reduce oversteer with limited adjustments at tbe track?

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A few thoughts:

You have made a lot of changes to your suspension but never had a pro look over your setup and make final tuning and corner balance adjustments? Maybe it is time.

I ride right seat in a lot of different cars with a lot of different drivers at the race track. The best handling cars always have a pro setup even if it is a mild build. The worst setups by far are DIY by enthusiastic drivers with little or no suspension experience. Several have been damn dangerous and ended their day early before backing into a wall or armco at 150mph.

There are just way too many variables and unknown unknowns to solve this issue on a car forum. Math and measurement is required. I suggest you find the best Porsche setup guy in your area and drop off your car for assessment and recommendations. The result will be quick and certain to get the numbers right. It will cost you some $$ but a lot less than a car write off I am sure.

Good luck with your car development.

PS: Markus, disconnecting the rear sway is a common tactic for racing in the rain to regain an element of control through standing water. It has resulted in many class wins along with proper rain tires under nearly un-driveable wet conditions. It will not cause any loss of rear wheel control so I suspect you are simply confused by the terminology. If you must disconnect it on a perfectly dry day to gain control of the car, you have a serious setup issue that must be addressed.