Got this pretty much sorted now, altho my values in the "pw adder" table are alot higher than karlos'.
But the cars much better to drive, ive also richened it up on boost as i was 13-13.5afr, Im now a stable 12 dead on boost.
Rob - like you say i get a breif split second lean spike and then it reverts back to where it should be afr wise on a rapid opening of the throttle.

Also im loving the decel fuel cut, extra fuel saving and engine braking!