The safest option is to sell your current ARB, and buy the front and rear pair from APR. You are then guaranteed of having a well balanced handling car.
The other option is workout what the stock anti-roll bars are and increase the stiffness front and rear by 50%, or maybe %60 rear, %40 front, for better turn in and less under steer..
There is nothing wrong, going stiffer on the front since you are stiffer at the rear as long as you don't go too stiff.
You need to know what you have at the moment. To get an idea you can measure the diameter of the front and rear with vernier calipers
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