I just put new leaf springs and KYB gas-a-just shocks on. Then I put 16x8 Torq Thrust II's with 245/50s on the rear. Now when I take anyone with me in the backseat the tires rub. Can I raise the rear-end by putting an extra leaf spring cushion in? Or is there something else I can do beside air shocks? I've pretty much spent my limit for the year. Any help would be appreciated.