Re: Duckbucker or Vintage rail on an HSH guitar
If you have the bridge HB split, then yes, there will be some hum.  I don't think you can split the Duck or the VR because of the 2 conductor cable.  If you want to completely cancel the hum from that position, either wire the bridge pickup to run full on with the middle Duck/VR, or get a RW/RP true single coil for the middle position.  But then you'll have hum when selecting the middle pickup only.