Hey Ova,
Boost readings look pretty good, even a smidge lower than mine so shouldn't be an overboost problem.
Your LPH readings again are pretty much guesswork by the Scangauge at the moment. You will be able to refine the rates and get more accurate readings once you have run through a couple of tank refills and made the adjustments in the gauge. They are pretty close to my figures though before adjusting the gauge.
The 13.9LPH usage looks pretty good, plenty of people on here have stated they get a lot worse.
0-100 times I'm no help with sorry mate. After my last car I feel like Fred Flintstone in the 'Trol and I'm just glad it gets to 100+
The smoke situation sounds a lot better. I get a puff when I give the peddle a quick kick and my wife was following me one day and said it blows a bit on gear changes. It's an auto so I assume she saw puffs as kicked up or when I gave it a bit of right foot.
Hopefully someone on here might know of a decent mechanic in your present location. I'd be getting someone trustworthy to go over it, especially the hoses, fixing what needs it, then present the list and invoice to the dealership with a copy to Mr Nissan, highlighting the two hoses you've found yourself that had problems.
Things definitely sound a lot better though mate. A good check of the hoses, replace the ones that need it and maybe throw it on a dyno to get it purring!
Good luck!!