What everyone else is getting isn't important here.
His Driving style shouldn't be questioned as he says it hasn't changed.
So obviously its a mechanical problem.
Going on what OP has tried already, I would, post logs as mentioned, run the car nearly out of fuel and go to a completely different servo. If you use BP, go to a Shell or a Caltex or United for example.
Then if that does nothing, get a boost leak test, then if that shows nothing, have a look at the O2 Sensors.
Start with the simple and cheap options first.
2013 Ford Focus ST - Performance Blue, Cobb AP
Gone 2006 3 MPS Sports - True Red, Koni FSD shocks, in dash OEM look Ebay GPS/DVD, Hypertech, RX8 Rims