This is future me writing in February 2021. My thoughts on springs and rates has changed significantly since this was written in Fall of 2016. Since then, the Jeep's suspension has been completely rebuilt and I have gained significant experience with tuned shocks.
While I won't say I didn't experience what I describe below, I now understand that these changes were inconsequentially small compared to the difference shock tuning makes.
I write this in an effort to stop those who are cherry picking this early documentation of my years long journey towards greater knowledge and understanding from using this to undermine my assertions today. It is my assertion that springs set the ride height and that shocks determine the ride.
And some thoughts on my springs and spacers after lots of pavement travel a full day of off-road. Adding the spacers to the current OME/Currie combo did very little to change the ride characteristics. Not at all like what I experienced after switching between the softer and stiffer spring rates. Something I noticed on both the street and trail is that the front and rear feel more balanced. With the stiffer OME949s at 216lbs/", I often felt that the rear didn't move a freely as the front 933s at 140lbs. Now with the slightly longer 931s still at 140lbs and the rear Curries at about 185lbs, I feel like both ends are working together more. The front/rear balance feels more even. The ride really does feel noticeably more compliant.
What still frustrates me is that, even though the math agrees with my experience, I am supposed to believe that springs don't effect the ride characteristics.
I don't know what to say except that I will carry on with what I am doing. I will argue that every little bit of consideration adds up into something meaningful. If you are in a position to play with coils, choose the lightest rate that provides the ride height you want. Adjust with spacers without needing to add bump stops extension.