What spring rate did you get as this may be a factor (steel bar, dual batt, winch etc etc + soft springs may = sag?)
If you are unhappy or unsure of a product there is no need to arm yourself with part #'s etc, just simply ask the guy why it's not sitting at the desired/advertised height. If they're good guys they'll tell you exactly why and be more then happy to go through and show you part #'s to reassure you, after all - it's in their best interest to keep you happy.
Just incase, here you go.
http://www.acetyresandauto.com.au/toyota-fj-cruiser-4x4-springs-front/tough-dog-coil-springs-td-tdc974