I have had the JKS shock mounts with Fox's for years and never had the nut back off.This Jeep has prerun 3 Baja 1000 at least twice each and numerous 500's,San Felipe etc,without any failures.
Even with bumpstops, the stiffer valving will put an extra load on the sheet metal used to support the shock. With the added compression and rebound, the sheet metal around the area will begin to flex/fatigue and eventually break.
The best way is a setup like T&J / national drivetrain's that uses more sheetmetal surface area and ties into the cage.