That is a lot of miles, I have 104000 in 3 years. 30th of August is the 3 year anniversary. Getting 340 miles at 100% charge, have been doing it for over a year. The most I have gotten is 345 miles, I also lowered it, so maybe aerodynamics has helped a little.
I just used the Eibach springs, it said on the description that you don't need to change anything out besides the springs. Don't know how many types of Eibach springs are available for the lightning.