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Well it's almost "too late" now. But here is what I learned about squeal, and most ppl think I'm nuts but I GOT RESULTS with this, where others failed.
Key thing, other than yes using the anti-squeal GREASE
(not the gummy RTV sort of stuff either, I actually did just fine using high temp bearing grease, but the greasey stuff that they call anti-squeal paste is good too)
is to do a very good set of break-in stops, otherwise know as bedding in the brakes. You have to be careful at first of course the pads aren't bedded at all. But you need to, on the initial road test, do a series of 4 or 5 very hard stops, meaning just before the abs starts kicking in, right at that edge. I would do them first at about 40 mph or so and if you want to go up from there that's fine. Watch your situation to make sure no one is even remotely close to you from behind. The bigger the brake the faster and harder you have to do it. Had a real bad problem like this with the ML 163 chassis and ultimately the truck was fixed by doing like 10 hard break-in stops, those brakes stunk like a burning pile of pig crap. Make sure you let the brakes cool down normally if they get that hot of course (no water). Don't know if it would improve your situation now or not, i never had much luck fixing a squeal after they started squealing, you have to do this on the first drive.
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