I had the same complaint about the rear being soft and mushy, but it also had a but of shudder or harshness with small imperfections in the road, like a bridge transition. I knew I was going to add the RPG Bump Stop kit and Fellow board members convinced me to also add RPG's National Spring upgrade. I got the standards based on what I haul and it's a great improvement both offroad but also on the street.
With the rear fixed my limit offroad became the front. I added RPG 3.0 coil overs and for my use my suspension is great offroad. Having said that, I loved how the stock Raptor was cushy over speed bumps and with the progressive RPG front coilovers speed bumps are now pretty harsh and the suspension doesn't give much when going over speed bumps.
I am honestly on the fence a bit about the front. I saved the OEM Fox setup and I may switch back as this is my daily driver and I get maybe a day a month offroad but more like 6-8 days a year. Going a bit slower offroad would eliminate the need for the front upgrade for me...joe