Have KYB gas adjust and can confirm, they’re stiffer than a class 8 trucks front shock. I’m going to grab a set of ViKing adjustable socks and B body shock plates pretty soon. Their website is being rebuilt at the moment and isn’t too helpful, but they’re taking orders over the phone currently. They have double and triple adjustment sets of Shocks available for $500-$1,200 a pair depending on performance level…plus it’s nice they actually list Aspen/Diplomat as options to shop for.
Link: http://www.vi-king.com/