I installed mine last night and used the middle setting. I run aftermarket springs effective rates about (350# front and back). I also have the 30mm hollow front bar.

I figure I'll never really know until my next day at the track. I'd rather be wrong on the understeer side than oversteer.

 

Mine is set to the middle greg... Good place to start at least, only gotten the back loose once under hard cornering.

 

Start out at the end of the bar. Run a session then come in and set it to the stiffest setting and see if you can notice the difference. Of course you want to test this in an area where there is plenty of safe runnoff and ther is no traffic around you.
Then adjust to suit.
Have fun.

 

You will notice, I started with mine on middle setting and moved to stiffest setting and could kick the rear out on the street without trying very hard. This on a turbo car but on slow corners so mostly off boost. Back onto the middle setting now.

+1 on above advice, the only way to get the feel of the different settings is to mess around with them where it is safe. Good luck, have fun.

 

Agreed. Turn 10 at Summit Point is not really the place I want to find out that I've dialed in too much oversteer!