Well because its an irish car it doesnt need to be mapped for fuel, because you have the exhaust and induction kit, it would be safer and more power rewarding to get it mapped.
But again, i think over fuel like you are getting is down to a lamba or something, so i would try a lamba first, or get checked out,
last thing you want is to pay for a map, and then on the map day not be able to get it mapped right due to a sensor.
AFM, Lambas, and knock sensors are fairly common trouble makers, most will give a fault code, but ive heard of lambas not.
If you have a straight through system are you getting boost spike and fuel cut??
On a tuning note, if you are going to get mapped, and would like a shake more power i would really recomend getting an Sti5 tmic, and a vf28 turbo.. should get them for around 300-400euro. You should have the yellow 440cc injectors already, so you should be able to see up and around a really useable 300bhp,