heres a bit of magura science for you:
Noise does not = power
just because back in the day everyone used tar / still does and they get a nice loud squeak it seems that everyone beleive that that is the sound you want when your brake is set up correctly/working great. Well it isnt. Set up your pads correctly like.. try everything the old 2p trick, taking your tyre off your rim so you can align the pads easier. Just anything, the swooshing noise usually happens when your pads are angled ( like mine were doing last night )