Im running 465mm 0.48 springs from my KTM 950adv Preload is 3mm.
Standard 0.44/4mm felt very harsh with my 105kg on them.
I removed the KYB spring perch stops and made some simple tubes (rather than cut new grooves) to support the spring perches, to allow me to try some different springs I have in various lengths.
This will also let me play with preload quite easily, don't want to go much less to save things rattling around lol.
Have some 0.50 ill try next but they are 470mm from newer kyb so just need a couple of shorter tubes to keep preload to a minimum.