Hi just adjusted mine tonight -they had been screwed maximum hard + took a bit to move adjuster nut forced why? shock hanging from shed roof with a vitesse wheel + tyre took absolutely ages to finaly get full scope out + get bumpstops out . Adjusted to fine position + came back slightly to save getting stuck again.Can both now be moved slowly by hand.

My first pair of koni front inserts died when tried to adjust them

after being prevously adjusted[forced] too hard + breaking when trying to adjust.Your shox look pretty good condition though.