Your probally looking for more SPL then, cause that setup has to be very acurate.
With the JL Audio amps you will run clean but always at the same impedence (as to a matching network), thus your not driving the subs as much as you really can.
2 options. New amp that can run at 1ohm or a set of subs that you can wire to 2-4 ohm and build a ported box.