mate
dyno is dyno
doesn't mean anything
when you drive on the road.when the car on boost?
early on late?
when the car hit full boost?
i think power figure is good.
with light mods for 270kw.
not bad at all.
my mate got T517z with head gasket / cams/ injector/ apexi pfc/ z32 afm. he made 322kw on 1.4bar.
your power is not too bad.
try put z32 afm and cams. it might change big time