The OME lift is only a 20mm lift, the design of the kit allows up to 20mm of spacers to be installed in the system. I am suprised the installer did not inform you as it is in the design brief of the system.
Drop me a PM / we can get about 60 to 70mm out of the WJ comfortably. The WJ is one of the most dificule vehicles to set up. Loaded things become VERY critical and the dynamices of the trucks spring / shock rates need to be 100%.
Sometimes
real vehcile specific knowledge from a specialist pays off.