There is just a lot of noise out there. Ear plugs are a necessity. Of some type, and I have also struggled to get the right ones.
They say the most noise comes from tire noise. That will never go away, unless, as they are supposedly doing, they come out with quieter tires.
The new Schuberth S2 full face is advertised as quieter. It's about $750.
Perhaps closing the air vents cuts down on some noise. I never tried that. But I do get less if I close the visor.