Not an x6 driver, but, if you move the motor inboard you generate less sideways load on the rear tyres than with an outboard motor.
You therefore need to lose side bite or the car will understeer.
Shorter top links give a higher roll centre and lose rear end grip so the car will rotate better.
In general a shorter link also makes the cars less "square" to drive as there is more camber change. A long camber link can make a car a bit snatchy to drive, especially on flat profile tyres.
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