Ive had similar brakes squeal issues, I got this response from gslrally whi sell QFM, DBA and RDA products
What I'd recommend would be a stick on shim kit, the abobroad minded persone best being the Project Mu one:
http://project-mu.co...other_shim.html
We sell a stack of these to suit the 4/2 pot Nissan calipers, and are the only thing that seems to fix the noise. They're $65 for the front set, and $55 for the rear set. If you were to get these, probably best to get a new set of pads so you get maximum use out of the shim.