Everyone knows that round-core strings have less tension than hex-core strings. Anyone know why? I just put on a set of Lo-Riders, where I'd previously used Sunbeams and although I was aware that Lo-Riders would be tighter than Sunbeams, I was unprepared for just HOW MUCH tighter they actually are. I had to tighten the truss rod quite a bit, and do a general setup to get it playable. So, why? Why the difference, when the gauges are the same? I truly don't understand how there can be such a large difference.