i think that is too light for Fox Shocks on a 4 seat long travel cage.
Like Mike said, if you are bottoming out on jumps its way too soft.
If you take it through the whoops at the dunes and it bottoms out frequently instead of skimming on the top of the whoops, its way too soft.
If at the dunes on any G-out you hit causes you to bottom out, its way too soft.
Of course, I am speaking when the rear is not carrying passengers.
I dont think its just a spring issue either, your shocks may not be valved correctly... you might need low-flow pistons in there as well as more shims inside to properly correct the issue.
It takes a lot of work to get a 4 seater rhino long travel to work well and most of the work is in the shock setup.