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I'd put catch can higher up on the list not the last. I'd also not bother with Dawes valve without doing needle valve at the same time, you gotta take turbo control away from ECU.
Intercooler is probably cracked already and leaking, any dark patches spreading about the fins near the end tanks? Don't forget that glow plugs timer mod should be high on the list too.
The ridiculous post glow time Nissan has set (5 mins) leads to all sort of problems.