Thanks, TJC1. This past summer I actually used the high 'E' string thinking that the smaller diameter would be better for cutting. While it is counter-intuitive, I believe you are right that the larger diameter would make for better separation as you are more 'sawing' than you are 'cutting'.
Thanks again for the input.
Yes, it is counterintuitive - but the thinner, unwound strings have two problems: 1. strength, and 2. more importantly, they will tend to slice your hands/fingers on those occasions where you are tempted to wrap some of it around your hands while you are working with it... On the other hand, the wound guitar strings are considerably thinner diameter compared to the pipe cutting version.