Needless to say, the rim strip (Velox) is the correct width for the wheel. The wheel is a narrow 27" from 1984, similar to a Mavic A119 in cross section. Not sure who made it, but I've had several just like it before, and with exactly the same problem. The problem is that the nipple access holes should, ideally, be centered in the trough where the rim strip goes. The spoke holes and reinforcements should, however, be offset slightly. In reality, the access holes tend not to be perfectly centered. When this happens, there's a cut into the wall of the rim strip trough and typically a sharp edge. OK, I should have taken a picture. The only cure, other than new wheels, would be a rim strip that was very wide and went up the side of the trough (not at all how it was designed to be), or smoothing the edges so that no tube damage can occur in those tiny circular areas the rim strip can't cover. I went with smoothing the edges. We'll see how reliable the wheel is now.
I typically talc, but not religiously. Depends on how close the bottle is.