Preload can stiffen the springs. I added ground cleanance via Larger Tires and took preload off the springs to soften the springs & ride. What is also inportant is the angle of the axles coming off the diffs. Mine are nearly neutral so I have max travel in both compress & extend of shock travel. Joyner, IMHO, put too much preload for ground clearance at the expense of proper shock action & CV joint health. Springs should be soft enough to cause a fair amount of sway when you dirve. You should be able to grab the rollbar from the side and lean the T2 fairly easy with your weight & pulling side to side. The sway/soft shock action keeps the wheels on the ground when going thu rough stuff and rock climbing. I still need to soften more. When I drove Lenny's T2 I noticed his is really soft much more than mine. This is where I will adj to. If the springs are too hard you will be more of a flat tracker, sliding instead of biteing into the surface. Notice how Nascar race cars have nearly NO shock action, smooth surface, and off -road racers have a ton of shock action, rough surface. You will like the 40/60 much better but you need soft springs to take advantage of the damping. Just a WAG, Wild A*s Guess, but I would go at least 40/60 in the front also. Remember you are lighter in the front requiring less spring rate. The Fox guys should know some of this stuff, my guy did when I bounce my choices off of him. Good luck.
rocmoc n AZ/Mexico