I love this Brother Robert, but I have a counterpoint:
Since these towels are undergoing very little agitation, I really doubt that they're losing any mass. The tiny differences in weight are the result of variation in the amount of water, sopping, etc in your separate measurements-- it's the water weight not the towel weight.
The Easyspin leaves the clothes pretty dry, but My Hoover kicks but. However, the Hoove won't hold 12 towels; maybe 8. 12 Stuffed and Bobloaded ??? Laundress where R U?
This weekend, I'll try the Hoover test for you, but they just had a news bulletin on TV saying that " Unfortunately for the Holidays, all Buffalo and Suburban Target stores are suddenly and mysteriously out of Jetcone towels. A cult of hot, handsome washer freaks is claiming responsability."