I also have a 2018 CC 4X4 with the Pentastar. While I have zero experience with the 6100 series I did put 5100 Blis on mine using the 2.1 setting. I did these myself and through much trial and error chose the 2.1 over the 2.8 setting. I also have the 5100s on the rear. At 2.8 my truck looked nose high with zero rake front to back. The 4th Gen has a high hood that gives the illusion that the front is higher than it actually is. Concerned about the UCA angle I initially installed them on the 1.6 setting but was disappointed with the almost 2 inches of rake on that setting. Not sure if I should go with the 2.1 or 2.8 I bit the bullet and wasted a whole day trying both setting while having more fun than should be allowed with spring compressors. At 2.8 it appeared nose high with zero rake on the passenger side and 1/4 inch on the driver side. At 2.1 it looked pretty near perfect level with 3/4 inch rake on passenger side and one inch on the driver side. Keep in mind this was newly installed with nothing torqued to spec and no settling, purely a visual cosmetic comparison. I’m still very pleased four months later with the 2.1 setting and run LT275/65R20 XT tires that are 34’s. Good luck with your install.
