What's their DC resistance reading? If its very high, even changing the magnet type may not do a great deal to sweeten the sound, even though the output is lower. But if its in the 6-8k ohm area, it could make a decent improvement. But still worth a try as you really need to discover these things for yourself. There's only so much you can gain from other people's descriptions. And even if you don't use the Alnico magnets now, you have them for later.