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I would suspect it is the injector over dispensing as glow plug will not affect smoke when tranny kicks down during acceleration. You can try this as a quick test for After glow.
1) Remove 'small' connector inside the GP relay.
2) Open up the cover. It is quite easy as it is clip on.
3) Lift the purple wire, make sure you do not mess up the other wires.
4) Replace cover and plug the connector back in, i.e. all wires connected except the purple one.
There is now After-Glow for about 45s. This will help to have complete combustion in cold start, at least for the first 45s anyway. If it does not help then put everything back and nothing loss, nothing gain. At least you tried.
Good luck.
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