The FSW should help, since it will actually add spring to the outside wheel and *reduce* spring to the inside wheel.
Also note that perfectly even temps across the tire may indicate too little negative camber for ultimate cornering grip. Straight line braking will heat the inside of the tire more than the outside, and cornering will heat the outside more than the inside. You may be able to pick up more overall cornering at a slight expense to outright braking ability, and go faster over-all with hotter inside temps. The only real way to know is to have real-time telemetry of tire temps during the run and figure out where you're losing time, but sometimes if you play with it a bit, you'll be able to sort it out w/ trial and error. But if Rusty says "it looks good", it's probably pretty dialed, he did a pretty good job w/ my setup.
If you're going to add neg camber in the rear, you'll probably end up getting a little pushy, in which case going back to a softer front spring might be just what the doctor ordered. Keep in mind that stiffer can "feel" much better, but can actually be slower. On the other hand, you're running some relatively soft rates all around. Hell, I'm running like 670/560 rates on my car...
(Which reminds me, your rear springs are much too soft to match up at all w/ any of the springs I've got for the Konis...)