other thing to bear in mind, the air temperature was 4-6 degree's whereas by 282 run was 10-12.
Yesturday was Cold!!! and ideal running conditions.
Stage 1 Tsi would definatley see 270's, before you start adding Intake, exhaust mods, near on par with the edition 30.
But, the K03 is a smaller turbo, so quite possibly not see as big a gains.
Typical Std GTi mk5 normally see's a 40bhp gain from just a map.