Karlos, as you've said your setup/powerband etc looks really good tbh and you seem happy with it! Be interesting to see what your egt's are so you could put your mind at rest as to how safe the setup is, then you can just enjoy it till the turbo dies lol.
After finally sorting some springs and having some time mine will be back in for round 2 of mapping so i'll let you know how it goes as mine is on a stage 3 t3. But running the bar of boost it currently is i'm really pleased with how it makes boost (a little later than yours i'd say but full boost by 3.5k roughly i'd say) but too early to say how good it will be.
Unfortunately the bigger turbo's that continue to make more power at the top on our little cvh's will inevitably be laggy to a point but that's the decision you've got to make.
A friend of mine is trying a fairly 'different' turbo on his 1.6 and isn't far off being ready now which could be very interesting if it does what we're hoping for