The only other thing I notice is the MAF reading at idle hovers around 9 kg/h (8.5-9.5) which I've read is low for these cars. The previous owner put a new MAF in (it certainly looks new) but I don't know from what manufacturer and the OEM MAF did not come with the car. Previous owner claims the entire intake was smoke-tested and the plastic intake pipe between airbox and turbo was replaced (it's an obviously new piece). Long term trims seem normal based on the current data, the frozen state reading when the code initially came up was at 19.5% at like half throttle around 3k rpm (I think I was accelerating). Fuel pressure is dead on 400kPa and the pump's at like 35% duty cycle at idle with half a tank. Some searching around other forums suggests others with these codes typically experience terrible fuel economy, but I'm showing 19 average on the instrument cluster and calculated 23 on a recent long highway drive.
Any thoughts? I'm used to LH2.4 and have never messed with a P2 car until now. Picture of the offending car at the top of my unplowed driveway which it glided up without any problems:
