No worries. Yeah just getting code numbers and bugger all certain cause data doesn't tell us everything, unless the person looking at problems is a Mechanic who is a Nissan Genius having worked there, i found this when i had a Subaru i sorted out loads problems with one time, got lucky on Airtasker finding Mechanic keen to do side gigs that worked at Subaru, total genius fully fixed all engine issues i had.
Maybe try Airtasker, asking for a mechanic who has worked on Navaras alot, pref at Nissan itself.
I went for a drive today with my brand new SCV, no more limps at all & no more engine shuddering for up to 30sec i got after pulling up after going up hills. I reckon i still have a rail pressure issue, im blowing so much black brown smoke on all accel under any load 
I am about to do Fuel Rail Pressure Sensor, hoping to sort that, couldn't remove it, locked in too tight, so need to go into a shop.
Go thru the list & check those codes and keep askin round, maybe try a different SCV.
I got mine for $80 i think off eBay, its working great, if it stuffs up i will buy a more expensive one but theyre not too cheap are they .
Seems weird you did the right steps to get rid of Limp Mode & still got it. Always install SCV the correct way up is a very important thing.
It doesn't work right apparently if fitted upside down, and both sides look the same, except the sensor plug. Plug should be at bottom when installed. The O-rings r sensitive too
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