In the real world I'm really not sure how much handling improvement you get out of stiffer/lower springs than the RBs. On a track with R-compounds it'll be a different story, but I'm continually amazed at just how well the RBs soak up bumpy, dirty, off-camber tarmac when driving aggressively on back roads, and they don't compromise the overall feel or balance of the car that Mazda did such a great job engineering. They do just enough to lower the CoG a bit, make the ride height look decent, and make up for wider, stickier road rubber. If body roll is an issue, sway bars are a much more effective solution, and sharpen the handling in general without compromising the car's ability to handle uneven surfaces. The dampers are something definitely on my list, though.