Xander, the weight of dacron is a component of its reduced performance vis a vis HMPE strings. Granted, not a big one, but a component. (Stretch is the bigger dacron culprit.) Keep in mind that the difference in weight between the BW tested strings was small because all of the strings tended to be skinny/light vis-a-vis dacron. They're close in weight to each other, but weigh quite a bit less than dacron. To build a dacron string of the same strength requires a thicker and thus substantially heavier string.