Sounds like the rear preload is still on factory setting 2nd notch (from lowest) of preload from what you say? If it that is the case, I would not be at all suprised that you're running low at the rear. (Of course I could be interpreting your description the wrong way round!) Mine was too saggy on the 2nd position, even when it was new (and as you've noticed I'm no heavyweight). Soon found the need for 4 clicks, then 5, then 7 and then... a new shock!

Get a tape and set the sag - best point to start with.

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