I am running mine without the antirattle shims at the moment and without squeel. Whereas the shims helped with previous pads, I have got away with a good dollop of Ceratec on the back of my current pads and a bit more on the piston faces for good measure
That picture above shows copper grease on the back of the pads - get that wiped off if you have not already done so and use Ceratec. The petroleum based copper grease rots away the rubber dust seals on Brembo calipers.
I found that any squeel fades away with a couple of weeks of use; if not I found that another reapplication of Ceratec sorted things out despite there being plenty there in the first place.
PS those Galfer-made pads are good!