This is what I'm finding too as I'm teaching myself how to make strings for my compound bows. I'm currently working with BCY X which is somewhat thinner than the 8125G I've been using to make my recurve strings. With 12 wraps around the posts of even a superbly constructed jig (mine is from Butch Baker), I need to spend some time making absolutely sure the strands are as equal in tension as I can possibly make them. It's usually the lower strands that go ever so slightly slack no matter how careful I am laying out the material. So it's some care and work before I tie it off and cut it free from the spool......
But on my recurve strings, which are just 12 strands, I pull on the bundle a couple times after laying it out and it's ready to go.
Going to fewer strands so far I've found only to affect the speed, fewer is slightly faster. If I go too low with a stretchier material, though, I'll start getting some peep rotation no matter how carefully I make the string.
I'm intrigued by the 8190F material, particularly for my recurve bows. Nothing wrong with 8125G, but I wouldn't mind taking a whack at it.....
DM