The bars do reduce sway,duh.
They also put more down force on the outside wheel and reduce the down force on the inside wheel.You can get it to the point it actually lifts the inside wheel off the ground under hard cornering.
The rear bar on my STi has three setting.On the stiffest setting it makes it real easy to throw the rearend out.Middle setting it is nuetral.Softest increases understeer.
Sounds like you might be just fine where you are now.
