I added their kit to my Wrangler -- ride quality is not as great as I want it to be above 65 MPH but I am trying to rule out tire pressure issues and alignment presently just to ensure that it's not the springs... which it very well may be. Love Currie -- will do my best to keep the entire kit on but if it ends up being the springs I'll have to swap them. Their arms are top notch, and the shocks (and stabalizer) are Fox, so even if I do swap springs, not like I feel like I wasted much and still very glad I have their arms =) But I may switch to the Evo 3 1/2" Plush Ride Springs.
Tires are Nitto Trail Grappler 37x12.50R17 on AEV Borah Beadlocks @ 31 PSI cold. Originally had them at 36 PSI cold, but dropped them 5 PSI. Didn't make much difference. I have the Tazer, so I will probably drop to 26 PSI cold.
Worth mentioning -- I have a winch up front (on stock steel bumper group) and the front sags pretty hard, so I probably will have to swap springs in the front either way. I don't really blame Currie for that, but I also don't want to add a spacer.
Have you done the chalk test to nail down the right PSI for your Jeep? Spit balling will get you close but, chalking will get you spot on.
As far as swapping the EVO plush ride springs from Currie, I thought I remember reading somewhere EVO was re-branding Currie components as their own. I don't remember where I read that so don't take that as gospel. I do remember seeing it, just ot sure if was on the Bookface or jkowners or what.
As far as the sag goes, any spring you throw up there is going to sag some. If throw a taller spring it's going to have a higher spring rate which will make your ride situation worse. Throw a 3/4" spring spacer up there and call it a day. Regain what you lost with the weight of the winch and keep the lower spring rate.