Mr Pig said:The Tora fitted to the Altitude 00 is the plain vanilla one which only has preload and rebound adjusters on it. I'm thinking about selling it and buying either the next one up,...........
What you are describing is the reason I'll probably never buy a complete mtb again.
Try giving Tim Flooks Tuned Shox a call - they are very knowledgable (and friendly) - they may be able to sort you out regarding rebound, and offer advice over whether or not it would be worth changing the spring.