Just got back from mapping.
Car feels great and mapped really well and easily to a very steady 0.8bar. No spiking or creep at all and no other issues except a possible sticky idle solenoid.
The main difference is the extra pull you get from the 2nd turbo. I couldn't really notice when it kicked in before as it was quite smooth. Now when you get to 4k all hell breaks loose! It really kicks you in the arse.
The power delivery in general is just so damn responsive. I can understand the desire for raw power from a big single, but when the twins are working this good it all makes a lot of sense.
All in all im very happy with the results. JayDee is a quality chap and would highly recommend!