We are starting to make a strong maintenance to a 7 years old S type R of our customer

We are going to substitute
A) spring with H&R spring (-2/3 cm)
B) remanufacture the Bilstein ( 20% stiffer)
C) all new bushings on sway bars
D) new front low wishbone L+R

Any of you could suggest us what else to change in this maintenance
We do not want to mount and unmount all again another time

Thanks for any suggestion