They do have them. Tal that's exactly my setup, using 642 or 640 Wilbers?
Wilbers are on the sporty side regarding spring rates. When delivered my 642s were 8 clicks for all 3 adjusters. I now run them at 4 from open on mains, and 5-low speed 8-high speed. The range of adjustment is considerable.
If they still aren't quite right, you can order one of the next spring rate down, and fit it to one shock. Ponters did it on his legendary bike and found it was an exact fit afterwards for his taste.