Maybe you should go test drive a 2014/2015 FRS at a dealership and see if you still have the same opinion about the suspension. I dont think there were any changes made to the suspension between model years for the FRS.
For the BRZ I think the 2015 improved ride quality even more, not sure how, its just what I've read a few times around here.
EDIT: I saw your WTB thread lol. Might want to look at this:
http://www.ft86club.com/forums/showthread.php?t=84230