ST = Suspension TechniquesWhat you say ST bar do you mean Steeda or ST? I am guessing Steeda?
Softest holes are at the ends of the bar, stiffest are the other direction. On Strano's bar, the softest setting is about the same as stock, middle setting is where you want it, and the stiff setting is like the ST stiff and Steeda soft.
A quick glance at the Whiteline bar tells me you'll want to buy collar locks if they're not included.