RRM RA GRIP Springs on a GTS

I've been looking around for a while for springs for my GTS, I had decided I was gonna go with the Eibach Sportlines but kept reading about how soft the Eibach springs are, and found that the drop wouldn't be the greatest for the amount of daily driving I do. I was thinking about the RRM Grip V2 springs for the GTS' but never though the 1.4" drop would look after they settle due to the fact I carry tools in my trunk and the rear would sag way lower than the front...and I hate that lifted look the lancers have up front.

Then recently I was searching the RRM site and noticed that they have come out with new GRIP springs for the RA's. The drop is 1.5" up front and 1.25" in the back, same drop in the front but less in the rear, just like I want for the simple fact that the car will have more weight from my tools in the rear (less sag). Now what Im wonder is what is the difference of using these springs designed for the RA compared to springs designed for the GTS? Obvisouly the drop is a little different, but because the RA is heavier is the spring rates much different? Would I run into any issues?


Thanks


Pic off RRM site with RA GRIP springs