Delta:
I decided to get the eyelets as close to the bottom of the thread as possible, then measured it. I came up with 67mm and made all shocks that length.
For tires, the range for the local tracks seems to be 37-42 shore. I generally prefer to try to get the same shore fr/rr for more even wear, but we all know sometimes that's not possible. At SVM yesterday, I ran 40/40.
I noticed the same thing with the front shocks on my friends car before I bought one. My car is the same and it doesn't seem to affect performance.
You'll love the car once you get it on a track.