i thought that was only if your going lower than round 35mm?
I'v been on 35mm spings for abut 2 years, springs only and nothing else, not had a problem.
couldnt say tbh bolton i went from 35mm to roughly about 70mm and i had a adjustable panhard on all the time...
my bros old one probably ended up somthing like 40mm after it had settled and he didnt have a panhard on...if that helps (youre gonna just have to try it i guess, only then will you know for definite.)