The actual rate you get at the wheel from a torsion bar depends on how long your lower control arm is (B/E different to A) and how wide your wheels/tires are.

The longer the LCA and the wider the wheel, the lower the actual rating you get at the wheel.

Take that into account if you are trying to maintain a handling balance front to back.

In fact on the subject of balance, if you just fit stiffer front suspension without taking into consideration how stiff the rear is you will just end up with a car that understeers badly.

If you have understeer with a 0.96 bar you will make it worse going to a 1.00 bar.
If you have oversteer with the 0.96 you would be right to try a 1.00 bar.