Most YouTube kids doing reaction videos to flashing a new tune make it seem like it adds 50-100hp. OMG WOW. In reality it's a subtle but noticeable improvement in mid range and power up top.
The throttle pedal lag after a tune will certainly make the car feelore tame.
I recall the stage 2+ tune taking a while to feel better, mainly because the throttle. That and shivs tune apparently does some learning of its own.
You may want to check the IAM while the car is running and driven around for a bit. Assuming you are running 93-94 octane you should get close to 1IAM. If you run 91 or poor quality fuel you are probably missing out on a fair bit of ignition timing.
I certainly noticed a difference going to stg2+. Mainly how the car felt in the mid range. Pulled a bit smoother and had a bit more linear feel and pulled nicely at redline.
I also flashed my car in December which has temps around 0c which is great for making power on these engines. On hot days with high intake temps the car feels more sluggish.
I also got a custom tune done from @
tomm.brz about 2 months after flashing the canned tune. His tune felt way stronger in the mid range compared to stg2+. You can see his timing curve with my setup is more dialed and fatter around 3-5k rpm.
Stg2+
https://datazap.me/u/mygotousername/...ata=1-7&solo=6
Custom
https://datazap.me/u/mygotousername/...log=0&data=1-6