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I think I'm right in saying that the 800 has a wet clutch?
This means that it's rather hard to see what lift you are getting from the slave unless you remove the clutch cover, then it will be messy as the oil will leak out!
For reference, after market slaves such as Oberon or FactoryRacing have a little less lift as they have larger pistons to reduce the effort at the lever. This gives better mechanical advantage but reduces the travel. The standard Ducati slave gives the most lift followed by Oberon and Factory Racing has the least.
You might be lucky to cure it with persistent bleeding as Darren suggests. They can be a swine to bleed sometimes.
You can get air bubbles up through the reservoir sometimes by just caressing the lever gently, only using the free play in the stroke.
I think your problem might be something to do with the engine oil though. If you use a "car" oil with lots of slippy additives it can make the wet clutch slip, so you need to use a motorcycle specific oil to prevent this.
Your problem is drag when cold though, so I'm wondering if its maybe due for an oil change or maybe you have the wrong viscosity in there?
Some fresh oil might give the plates a wash and help matters maybe? Or perhaps an actual wash of the plates to get rid of any contamination, during an oil change would do the trick?
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