Most of the diesels smoke a some stage of accelerating, makes little if any changes if you run it on Shell or other proper fuels against cheap supermarket fuel. The power upgrade will make more smoke due to elevated fuel pressures and greater amounts of fuel injected, and as you clearly have done most of the obvious fixes, there is one that not many have spoken about.
It is not uncommon for the turbo seals to allow a small amount of oil through to the lower hose attached to the intercooler, this is again quite normal and no real problems to the car, but the long term effect is this.....
The intercooler has a small puddle of oil at the bottom, when the charge is generated by the turbo unit, it enters the intercooler, whips up a nice oil contaminated mist collectively with the hot gasses and then is introduced into the inlet tract and then off it goes into the engine and becomes burnt causing noticeable smoke.
This is worsened by the fact that the intercooler internals are heavily coated in oil from many years of punishment of hot gasses and oil mist. The efficiency of the cooler is marred and the engine fueling will be right but the gasses will contaminate everything it travels through ! On my car which has the 160 and also a synergy 2a on mid settings smokes fairly well under heavy load usage, the plan is to remove the intercooler and clean out with brake cleaner thoroughly, This will enable fresh intake gasses cooled properly.
Sorry for the long winded reply, but you did ask for info !
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