Middle

Lowered to the max.  Great on-rails kind of feel.  Steering is pretty heavy - esp at low speed.  Driveways are an issue & scrapes to the tow hooks in front are common.  The clincher is the lack of shock travel.  Three times I have hit pavement differences of ~ 2" at high speed - and I mean hit.  It sounded & felt like no suspension was in play in the front.  The A arms are slightly up versus level or down at this height.  
So I guess I found the lowest height possible with this car/wheel/tire combination.  But, it's too low.

Bottom

Finally set - again.  This time a little higher than the lowest of lows.  Very good control.  Light steering effort - bonus points here.  Not quite as much on-rails feel though.  Driveways are less of a problem & I can actually feel the shocks working at speed now.

Addendum:  I lowered it slightly in the front compared to the photo.  Down about 1/4" to try to reduce a floaty feel to the suspension.  Front shocks are also suspect & will be replaced next season.