Completely understand where you are coming from mate as peak figures are just that and could mean nothing if the rest of the rev range makes no power. Subaru's are a different kettle of fish though as especially imports had to be mapped well for running on UK fuel. Most flash maps for ST's are generally spot on never head of any running problems with them at the end of the personal preference as to what type of map you want. Ideally you want smooth map without a massive torque spike as the clutch won't put up with it for too long.