Hi TimothyO -
Yup. I've done the same experiment twice now, one with a matched set of PDs about a year ago, then again about 2 months ago with two P1s. I have come to the very same conclusion. It's not even close, Gut/Poly wins the spin contest by a wide margin.
9x Donnay Pro One 97, Custom Ordered 62ra | RPNY Leather | Gut/Zx | 12.7oz, 12hl, 340sw | Currently Mod Tinkering w Tec315Ltd., Blade98s, Steam105s