Vary the amount of toe in, either less or more.
Some bikes I have had with brake squeal, often it has eventually gotten quieter, so each time you try something, ride for several days or a week before trying something else.
If that does not work, try cleaning the wheel with soap and water. And take the wheel out so you can clean the pads with soap and water with a brush. I am in USA, a soap that is particularly good at cleaning off petroleum residue is Dawn dish soap, I do not know if that is sold where you are or not.
If the above does not work, try lightly sanding down the surface of the pads. But those pads are expensive, do not wear too much off of them. If there is any coating of something on the pads that is contaminating the pad surface, this could reduce that contamination or eliminate it. I only mention this because on some of my non-CSS bikes, when I have a lot of Aluminum Oxide built up on my pads, I often sand most of that Aluminum oxide off of them to get back down to the rubber. Thus I regularly sand down rim brake pads.
If nothing else seems to work, squeal is a high frequency oscillation, can you figure out exactly what is vibrating? If you reach down to the brake area while riding, be very careful you do not get your fingers caught in anything.