Seems this topic has been going on for some time, sorry I must have been asleep.
My ZB was fitted with spax adjustables some years ago, clearly some time ago as the adjusters on the front ones were rusted up, they are also not facing the correct way for easy adjustment!
When first purchased the ride was very choppy at the back so I slackened the adjustment to just 1 click up from minimum. Problem solved.
When I rebuilt the front suspension, new rubbers and tie rod repairs I found it impossible to disconnect the bottom of one of the front shocks so had to cut thru the bottom eye using a hacksaw blade between the spring coils. It took a complete day, but so what I am beyond paid work!
Fitted new spax adjustable, purchased from Rimmer Bros £170 per pair delivered, set them to 1 click up from minimum and they seem fine for road driving.
I have set the adjusting screws at the inside, rather than behind the king pin assembly but they are still a pig to adjust, you need lots of special bent screwdrivers!
I did try to have some specially made with the adjusting screws accessible either from the front or rear of the spring but £££££££££.
When researching shocks it seems that all the adjustable s are naturally firmer than original equipment.
Hope these ramblings are of value.