the shorties squeal because they flex. they flex becausde they have long arms for a low-profile canti [which is good because it provides greater leverage] and because the arms are machined out at the back [makes 'em lighter]. the problem is that this adds up to a slightly flexy canti arm, and that equals squeak.
you can toe-in radically to minimize the squeal, but it never goes away -- and you'll go through pads like candy. so you have a trade-off.