I think there's a rather blurry line between "being concerned for the longevity of the engine" and "talking rubbish and doing too much research".
Half the reason why your TD27s have lasted as long as they have is because Nissan over-engineered them.
That's all we're doing. I'm sure that in some people's experiences we talk HUGE amounts of shit - just go look in the 2-stroke thread, or in the DPF removal threads where we're talking about things like HO2S being spaced a few mm here or there. Now THAT is getting into the fine stuff and it's boring as batshit for many - but others like it, they enjoy the discussions and they get something out of it.
I think Jimmy can relax a little with your input though - it helps, knowing that the TD27 is a much more robust engine than many may have thought.
Jimmy - are you intercooling it? That will help lower temps a little and will help if anything goes wrong with the turbo. On the subject of turbos themselves, make sure you have a read in the "Caring For Your Turbocharger" FAQ.