Your spring must be wrong/bad. I just looked at mine, preloaded spring length on the bike is approx 250mm. Free length of a 5.2 I have on the shelf (both Sachs springs, same length) is 260mm, so it works out.
The original point of the thread was to NOT get hung up on the sag numbers, but tune the suspension by FEEL while limiting preload to 10mm. Preload does matter, and affects the feel of the initial travel. I think any tuner will agree that 25mm preload is off the map and something is wrong.
As far as the shock itself, one original issue was the piston band being loose. Les would fix this by using a WP band with a different oring under it, then Sachs updated the part. I have had zero problems with my shock, but it has been to Les for updates, valving and service since new. Not everyone knows the details as well as him. Last time it was just the fluid that needed changing, rebound was creeping up and needed more clicks in. Fine now. I used 195 PSI nitrogen.
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