I think your maintenance regime for the engine looks just fine.
It must be very frustrating to have this problem happening again.
I’m not clear on exactly what is the cause of the problem, but then I’m no diesel mechanic! Has that been clearly laid out by Volvo to your satisfaction?
That tell-tale puff of smoke is interesting, which I guess tells of oil ending up where it shouldn’t be and then burning off. I wonder if you can share a few more details about the exact circumstances around when it puffs... does it happen once, only under load, in neutral, idling and then gunning quickly etc. That would allow others to test and report comparisons.
I have the same D3–110i-C model and the Amel specified autoprop. My WOT is 2950-3000rpm.
I hope for a satisfactory resolution for you, it inspires no confidence in your planned travels when things like this happen.
Amel 54 #154
Sent from my iPhone X