My Land Rover has aftermarket parabolic leaf springs fitted. These offer so much greater articulation that matching longer travel dampers have to be fitted. The main advantage though is that with just two leaves used there are fewer sliding surfaces between them, allowing better compliance. This also offers better tolerance to infrequent lubrication FWIW.
TBM's findings of an improvement with fewer leaves makes me wonder if there are advantages of using fewer still but stiffer leaves with a Mog.
