Lack of droop doesn't adversely affect Mini's handling... saves you
adding sway bars, stops traction rolling.

Standard 'chrome' springs that come with the M03 kit works best, same as the silver ones given when you buy the CVA shocks.
None of the coloured ones work any obviously better, so why bother?

If you really want to investigate effects of various options on
the M03, you need TWO vehicles for true back-to-back testing.
Otherwise hey, it ain't very scientific...