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If I may suggest you select the front bar with the rate you like and fit an adjustable rear bar. The changes you are likely to want to make are probably best made to rear roll rate.
Additional front grip is easily achieved by fitting camber adjustment. Either crash bolts or camber plates depending on how much negative front camber suits you.
In my experience this chassis is limited by rear grip. Most aftermarket setups add front roll stiffness either by higher rate springs or roll bar.
I did the opposite by fitting softer 2017 rear springs to achieve more relative front grip. The 20 mm front bar also pushed roll stiffness forwards. . My car has a Supercharger and benefits from less roll stiffness at the rear. Increasing roll stiffness also reduces grip delivered by the inside tire in favour of increasing grip of the outside tire. The Torsen differential is not quite the same as a clutch type LSD and only works well if both drive wheels have solid road grip.
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