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Good reading this, especially as you're in the British isles!
A simple question this but are you sure you've got full throttle? Worth a check! Especially as you stated the idle deceleration switch wasn't activated by the throttle, and as you said it didn't kick down too easily either.
Your problem sounds like a bothersome one, how're you getting on with it in the last month? From what you say your engine sounds fine - compression, check - electrical functions, checked with the X11 port diagnosis - it doesn't misfire or anything, so perhaps it's ignition timing related or fuel pressure/delivery related?
If you want to go one step further try unplugging the EHA, the black thing on the side of the fuel distributor. It will prevent the electrical systems from doing anything to the mixture at all, and you're running entirely mechanical injection then. Yet it should still run 95% normally once warmed up. Basically unplugging it shouldn't make a life-changing difference in my experience. If it does maybe something's up?
Can't help otherwise but keep us updated it was good reading!
By the way your timing dial should be on 'S' not 'N' - for 95 RON and above (that's UK ron rating, the US is different but they don't get the dial anyway I heard).
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