I see you're still struggling with this AMG, I had a go at trying to find a code list for ya, but like the mines search I did, nothing came up.
I've just thought though, It may be worth you getting a stock ECU and running the car for a bit, stay off the loud pedal so you don't get boost/fuel cut, and see if the problems manifest at all. If they do, do the code check again, but this time hopefully, the stock ECU will throw codes out that we can understand.
If the problems don't come about, you know then that your blitz ecu is fubard. Stick with the stock ECU and fit the boost/fuel cut from whifbitz. All in all, if that sorts it, your total expenditure for the repair will be a reasonable £160.