Here's a couple of "off the wall" alignment ideas. 1) Try to measure the tire with a infared thermometer and get the temp readings of the tires "inside", "mid tread", and "outside" after a drive. It might give you at least a direction to go in your quest for the optimium alignment spec's. 2)When you lowered the suspension, did you also change the height of the tie rods/steering box or are the tie rods running at a large angle? I know in our VW drag cars with narrowed and lowered front ends that they drastically change their "toe setting" as the ride height changes (because of short tie rods). In our case we set the front alignment with the front end jacked up and the front tires "almost off the ground" to simulate the cars attitude when crossing the finish line.