From a little research it seems that the ECU / brain of the engine limit's the turbo / power in lower gears.... that coupled with the fact that the turbo has more time to ramp up in higher gears etc all means you get more torque at the flywheel in higher gears - for the 2.2 it will peak at about 2500rpm.
Realy there isn't anything else that could be 'slipping' between the flywheel and roadwheels, I'm thinking you are going to have to get the clutch looked at.
Can you let me know the outcome please as I've just bought one!
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