I think with the type of riding you do the heavy springs would work great. And if you add more weight to the car then the springs will help........If your looking at better ride then your next step would be valving the shocks. I would do that first then invest in new springs.
How is the ride height? My MT springs seem to be sagging and I am thinking of trying those RT dual rates. I was thinking of going with the heavy rating to eliminate sag after settling. What's your thoughts? I still haven't grabbed wheels...need to but right now I am gonna spend funds on the suspension