That's great advice, but my struggle is finding a 25ft long, ideally at least 6 foot wide, perfectly level surface. Because even slightly unlevel, at 25ft, makes a significant difference.
I just cranked them down from the factory setting, in very small measured increments, until people on the hwy stopped flashing me.
89 XJ (Ltd): RE 3.5", full leafs, 3/4" coil spacers, RE monotubes, JKS Adj trac, tcase drop, OME steering stab., BFG AT 31x10.5xR15s on 15x8 3.75bs, Borla cat-back
14 WK2 SRT: DiabloSport catch can, Borla S-Type