Yes, my leafs are aftermarket Nationals arched negative from stock.
My Nationals also have the bushing/mount problem that RPG is discussing with National (mine slid off the front passenger bushing and now rubs against the mount). No solution yet (I have tried to "re-set" them per RPG forum post a few weeks ago but the front passenger side just slid back up against the mount again after a few days of driving). So still waiting on a fix for that.
I have contemplated putting the stock springs back on but it looks like in RPG's install instructions for its Stage 2 kit that they provide some extra hardware so that you can modify slightly the factory block (drilling new pin holes and adding the hardware) so that their strike plate can fit under the factory block? Seems like a PITA, but maybe I am reading the instructions wrong. Would be nice to just drop the factory block and leafs back into place with the RPG strike plate but I guess that does not work?? Anyone with insights?
Maybe I just revert to Stage 1, and put back the rubber jounce. Understand the ICON truck runs this way and has survived Raptor Expedition outings plus more.
Not really interested in heading to Baja with Treypal and hearing that leaf rub against the mount for 5 days.