like everyone has said dont use the low fr springs use the original big bore springs.
what is happening from the sound of it is the rear suspension is collapsing causing the inner front wheel to lift. this can be prevented by running stiffer rear springs and matching the damping accordingly. moving the rear shocks in on the tower will increase side bite and make the suspension feel softer standing the shocks up will reduce side bite and increase steering.
http://www.petitrc.com/reglages/BuggySetupGuide.pdf
this should help you