Got my leaf springs modified with a half rebound leaf as per @powelmac and fitted them this morning
Only drama was with the extra leaf my U-bolts were out of length, so following this thread I unbolted the pack and got rid of the small bottom leaf.
Took it for a decent hit this arvo, apart from feeling it has enough power to tear a hole in the horizon (after 2 weeks of driving a Hino) the rear end feels great. Not a hint of tramp, and doesn't hook up too bad either, from third gear roll ons that is.
@Ford Freak FYI
Looks very unexciting but seems to work well, will update how it goes over the next couple of weeks.