Sounds like a decent car Mate. Try and find someone who is used to tuning 300tdi Discoveries as they have the same injector pump etc. They will likely sort you out. There are better adjustments to make on the top aneroid part of the Inj pump so you can wind the centre screw back out a bit to restore a bit of poke and bring the idle back up. The TD engine with automatic is normally respectably quick.
Changing the glow plug no.6 is a bit of a bugger but if you loosen and not remove the bus bar nut (slide the copper plate out from under the loosened nut) and then work on the plug from the drivers side with a 10 mil fork spanner, leaning over the valve cover, it can be done.
cheers, Steve
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