Front brake squeal when coming to a stop with wheel turned
 

https://youtu.be/3LWIsOzRcWQ

Would appreciate it so much if someone can diagnose wtf this is. I've been trying to solve it for half a year, spending loads on repairs and parts. About ready to just swap the kit out.

The kit is a budget Wilwood 2 piston caliper with slotted rotors package from RR-Racing.

Things I've tried:
Used BP10 and Polymatrix Q compounds, both supposed to be quiet and low brake dust.
Wilwood support has been unhelpful, telling me to center the caliper and buy shims. Caliper is dead center and I bought shims off of them and noise is the same.
Brakes have been freshly bled.
Anti-seize at all contact points.

Things to note:
Like title states, noise is heard when coming to a stop. Usually no noise until brakes are moderately used. It also may occur at low speed corners when the brake is depressed a certain degree. Soft braking and hard braking do not trigger the noise.

Cheers.

How do you bed in the pads?

I've bedded each pad the same way according to the instructions from Wilwood:

A couple warm up stops from 45 to 30 mph, a series of hard stops from 60 to 5 with a few second intervals in between, then finally letting it cool for a few hours.