An update - It did ride some better with the Illuminas on "1", but it's still bit stiffer than I'd like. The car lifts a wheel over uneven surfaces a bit easier than before, too. It's looking more like I won't be keeping this combination. I think I gave up as much as I gained with this swap. I'm going to shoot an email to Tokico to get some more info on the Illumina vs. the HP to see how well they would with stock springs. My plan right now is to cut the stock front springs just enough to drop me about 1". I'd leave the rears alone if using the Illuminas because mine sat low in the rear anyway and the Illumina perch is about 1" lower.
I'm just not sold on stiffer springs for this car, especially with the big sway bars and the AutoX bracket. With as much everyday driving as I do, the ride quality compromises and iffy improvement in handling aren't enough to justify the killer stance.