If you're committed to the 18" rims:

* Get rid of those POS Aerospeed springs.
Not only is the drop leaving you short changed in terms of suspension travel, the spring rate is likely to be too low to compensate for the lack of travel.

(Does anyone know the spring rates for the Aerospeed springs?)

* Substitute with a set of Tein S-Tech springs.

* Purchase a set of Tokico Illumina (or KYB AGX or Koni Yellow) adjustable shocks.

*Install and re-align the suspension.

* Learn to love a 1.3" to 1.5" drop.

* Do not neglect your alignment once the new springs and shocks are installed. Excessive toe-in (or out) will tear up your tires within a few hundred miles.