Other XC90 Problem: Excessive smoke (inconsistently)

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Hi everyone,

I've recently bought a 2006 Volvo XC90 D5 185bhp AWD with 180,000 miles on the clock and its a great car and ideal for our family of 7. It's a great upgrade for us and were delighted as it was an inexpensive purchase as I bought it with some smoke coming out of the exhaust.

I'm well-read on the forums of the smoke/intake sludge/turbo/rings/valve guides issues/PCV/DPF Soot blockages - however, I don't really know what is the root cause.

The cars behaviours

1) No smoke on startup
2) When warm there seems to be inconsistent smoke(alot) on throttle off but this is only sometimes.
3) There is some smoke on accelerating
4) There is no whistling noise from the engine, breather system or turbo
5) Vida reports only 3 fault codes which are cylinders 1, 3 and 5 glow plugs - these are being replaced today.
6) Vida reports no other engine-related codes.

My plan so far is:

1) I have performed a DPF regen with VIDA and it was successful after 34 minutes - the Soot filter has cleared fro the moment and the car drives normally - DONE.
2) I have replaced the oil and filter with 0 / 40 fully synthetic oil - DONE.
3) I will be replacing the PCV and checking the breather system for any blockages - part ordered and awaiting delivery.
4) I will be taking apart and be cleaning the ERG/intake assembly - awaiting carb cleaner.
5) I was concerned with too much fuel in the cylinders due to faulty injectors but my VIDA reports all injectors consistent with readings of 0.3 through to -.39 - this appears to be very good and normal. DONE
6) I may consider a compression test but as the engine runs nicely and the injectors are reporting constant numbers I don't see the benefit of this immediately - Will do if I'm flummoxed.

I was also thinking about taking out all the injectors and putting some carbon cleaner into each cylinder with a view to change the oil after running the engine for half an hour and to clean out the crap - would this release the oil control rings if they are stuck?

Ultimately, if I need to have an engine change or a turbo then I will have that done (the car was so cheap!) but I hope for an easy fix.

Most importantly I want to identify the issue - can any expert on these forums help with any additional thoughts?

I will, of course, feedback my findings in this post to help others with similar issues.