I think it is more fair to fractal that you contact support instead of posting the same negative posts over and over again.
I gave you a solution for the hiss and it does,t function for you so i quess since your problem is still there and unique for you that either you have a setting wrong
or you have a bad unit, either way give support the chance to solve it, i can assure you that you are in good hands for support. Personally i never met a company with such stunning support as fractal and G66.
And for you it,s more fun to enjoy your axe when this is solved.
Good luck with it, i know for sure the guys from fractal will fix it for you and you can start enjoying the unit without the frustration.