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Cars with powerflex bushes in particular have loads of hysteresis / stiction. Sit in the boot, it goes down 40mm, get out and it only goes up 30mm type thing. Until you jump around a bit to help settle it. So that makes the spring/damper less effective which increases contact patch variation and reduces outright grip.
Can minimise this by loosening the beam & damper bolts and torquing them up at ride height not at full rebound. It’s just general good practice for assembling a car properly but I bet no garages other than main dealers (where it’s specifically written in the workshop manual) bother.
And then even though the bushes look really solid I bet if you put a go pro on or something you’d see a fair amount of lateral compliance when cornering on hot semi slicks on track. Adds toe in to the outside wheel and adds toe out to the inside wheel during cornering. Sounds helpful for stability but not helpful for consistency or outright grip.