Decided to make a summary of the performance differences between the tunes. So current setup is this:
Mk5 Golf GTI Edition 30 DSG
RPM Power Engine Management Stage 2+ custom remap + DSG Stage 2 remap 
Engine mods:
- VW Racing cold air intake (VWR12G5GT)
 - Darkside Developments S3 uprated IC with alloy end tanks and silicone boost hoses
 - Go Fast Bits DV+
 - NGK Iridium BKR7EIX spark plugs
 - R8 red ignition coil pack set
 - LOBA's HPFP
 - RS4 fuel pressure regulator valve
 - CTS Turbo intake manifold runner flap delete kit
 - CTS Turbo throttle pipe
 - CTS Turbo turbo outlet pipe
 - Forge Motorsport oil catch tank system for vehicles with charcoal filter (FMMK5CTC)
 - Creations Motorsport Exhaust manifold heat shield
 - BCS Powervalve TBE Prestige system with 200 cell cat and wrapped DP
 - Vibra-Technics bottom engine mount/Subframe mount (VAG520M)
 - Vibra-Technics dogbone mount (VAG455B)
 - DSG remap
 

It has now made 367 BHP and 499 Nm/368 lbf*ft.
This is a graph comparing the WHP difference between the previous tune (red) with the CAI fitted and ~345 BHP with the current tune (blue) using BP Ultimate 98 octane.

It's now much faster at mid range rpm. 
