247g/s would equate to 305hp. But that doesnt take into account any extra power from the timing advance, where one of the main issue seems to be, so with the timing retarded as much as you say, it would explain the low power.
Originally your DSG was limiting all timing advance so that no matter what timing the car was asked to advance, it was always limited, hence no timing pull. They got around that somehow, car running well. Then the DSG remap, and all of a sudden the car starts to retard timing back in an extreme way, resulting in the new maps with much reduced timing.
We've seen in the logs you have a boost spike, and your previous logs show some high timing pull on what was previously a map without timing pull. Its also evident the ECU is closing the throttle a little when on full throttle at high RPM and full load. Your also throwing out black smoke, so something has to be amiss.
Does VCDS allow you to monitor knock protection or even better previous knock protction. Also Misfire counts etc.
@ Alex what sort of issues would normally cause the car to retard timing, apart from high IATs. Black smoke is normally unburnt fuel, so related maybe? When a car retards timing, does it do that by closing the throttle body a little or is that something else causing that etc.
Dom are you at the open day tomorrow?