I found your post interesting.
My 2013 Touring A/T has much the same mods.
-Nismo S-Tune cat back
-Nismo cam set
I still have the original tuning print outs from a few years ago.
It is unfortunate that you did not do a full dyno tune.
You are correct,the hell with the numbers. Its how the car now drives.
Keep in mind that you can spend 1000's on bolt ons.You will never get
tire burning performance without FI.
Overall,myZ feels more reponsive. "Lighter" if you will.
Here are the numbers:
Baseline HP 241.79
Change HP 278.97
Baseline Torque 217.12
Change Torque 255.65
All tuning was done by Z1 Motorsports
In addition,my A/T was adjusted to give more mid-range power.
I have since installed a Transgo mod to my tranny.
I'm pretty happy with the results.
Hopefully these numbers will give you an idea of your results.