Is there a certain proportion theres supposed to be between the torsion bar and sway bar?
The relationship is one debated in circle track. More important for this situation is the relationship of the front to rear roll rates.
If the rear becomes too stiff in relative to the front it will have more of a tendency to oversteer. Think fishtailing, especially on a wet downhill curve.
So if you are increasing the rear spring rates, or adding a rear sway bar, then a larger front sway bar, like 1.125" to 1.25" would be in order.
The stiffer the front sway bar, the less independent each wheel is. For street use, with typical all season radials, I wouldn't go too stiff. Try either stock factory or smallest aftermarket sway bar (which may be 1.125"), unless as mentioned above, you're adding a rear bar or stiffer leafs.
Removing wieght on either end of the car has similar effect to installing stiffer springs.