yes, the R+D is what makes this fun! Mine was a nightmare when I got it: basically hung a hard right when I hammered it, and bounced along like a pogo stick- its getting good now, but I think it can be really good, just one thing at a time as time/$$/brainpower allows!
Compared to many car related things, springs are relatively cheap and easy to swap out. If yours is balanced now under steady throttle, braking doesnt count
if you add springs by equal percentages for front and rear, you can end up with ones that you can swap from front to back, making it even cheaper.
For example, I'm going to try a bit stiffer ones- I will move my fronts to the rear, and just buy new fronts. Currently my fronts are 24% stiffer than the backs, so I will buy new fronts that are 24% stiffer.