@jonnyc : have you got a dyno plot from the DD run you can share ? be good to see the shape
did you run with the Toyos on that day?
out of interest do you have a before (i.e. std) dyno plot way back in the day.
@ SteveP : which HPFP you running then ?
in general I would agree DD rollers are pessimistic (in comparison to all other rollers) but very reproducible.
(I would however say Im not entirely convinced about DSG vs Manual readings on any RRoads)
Given that most mapping companies will quite happily flash your software back on , then some comparitive tests dont sound too bad an idea ... (the only downside I see is having to flash to stock each time and the flash counter being incremented as you go between diff vendor maps (SC aside I believe))