I read your write up on the Whiteline springs. I LOVE Whiteline products. Always my go-to for anything suspension or bushing related. That said, I was kind of surprised in your feelings on them, due to the spring rate. Originally, I thought the 2015 was considerably heavier than my 04. So I looked it up and it is heavier, but not by much. So that made me even more surprised in those springs. If you recall, I was recently talking about the RCE Yellows I have installed. While I like them, for a street or daily driven ride, I think I should have gone with the Blacks.
Meanwhile, I look up the RCE Yellow spring rate and found out your Whiteline springs are stiffer than my Yellows! So I'm kind of surprised that you thought the ride wasn't too harsh and so forth. The 2015 chassis must be corner balanced much differently than the early GD's.
Do you have sway bars and other suspension goodies, in addition to those springs?