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I would go to 27s in the rear, with 21s up front.
I'll leave the explanation of the different functions of the two components to guys who know more than me, but the simple take on it would be that torsion bars primarily allow the car to absorb and adapt to uneven surfaces (bumps) and secondarily work to reduce body roll. If you were trying to do all the roll reduction with only torsion bars, you'd have a very uncomfortable car.
I would get adjustable swaybars, front and rear, so you can fine tune your car's handling.
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