Hey this is gs14racer from nico with the s14.
Let me just say from one crazy person with lots of time to another, great job. Its good to see so many quality swaps coming along and yours is money!!!!
As per your dyno, i remember the same disappointment, because it feels faster than it says on the paper doesnt it? However in your case i think you have another problem. The knock sensors are notorious for dropponig lots of power on these motors, assuming youve checked these and know them to be good, here are a few places i think you can improve, the headers seem a little restrictive plus the cats arent helping either, ( i know you probably require them where you live), and the exhaust looks to be 2.5 from the pictures which seems good, but 3" is where its at.
These motors really like to breath, and the most you can do that the better off your gonna be, for reference heres my dyno run, granted this was on a 100 degree day in miami, in the winter months the motor put down a solid 295whp with the tuned ecu. The only differnce between yours and mine are the headers and dual 3 inch exhuast.
Of course you could always supercharge it like i did, and make gobs more power, but the above mentioned things will still hurt you there as well.
Once again great job, let me know if you need any info.