Low power / changed almost everything - what's next?

Thanks as ever @sierrafery / @Anaconda,

So today we checked the fuel pressure.
On idle we're seeing over 4 bar and probably hovers mostly around 4.5 bar:
It drops slightly on hard acceleration but not significantly and not below 4 bar.

We also adjusted the injectors.
They all needed about a quarter of a turn but, again, nothing significant.

After checking / adjusting we took it for a drive and there's no significant difference.
It still feels sluggish.

However, checking the nanocom after the drive there are a few new errors:
(1,5) Driver Demand Problem 1, (Logged Low)
(2,8) Ambient Pressure Circuit, (Logged Low)
(4,1) Inlet Air Temperature Circuit, (Logged High)
(4,3) Coolant Temperature Circuit, (Logged High)

The injector cleaner has been through but we're going to chuck some more through it to be on the safe side.

Erase those codes then read again after a drive cos nothing in the live data log seems wrong as to trigger such codes but if they come back the ECU defaults to a limited fuelling protocol and then it's normal to be powerless

Cleared the codes and then went for a bit of a spirited drive (nothing crazy) and the errors didn't come back.

Going to try a few more things...