i use to have this squeal, especially loud when stopping from slow speeds or just before coming to rest on my older 180. I was running Racing gear pads though with dba slotted discs, from what i understood its actually the setup of having steel pads they will squeal, they also put out unbelievably hard brake dust to wash of the wheels used to cake on very easily, eventually got fed up and switched to ebc green stuff.

V interested in your findings as my next upgrade was going to be the brakes and have had much about the combo you have mentioned, although if theyre going to squeal like buggering i might just go with green stuff again.