Out of those three combinations, i find the 4s11 to be the least dynamic and darker sounding. The belden seems to clean up bass, midrange and up, but leaves a bump in the upper-bass. The 4s8 is for me the best of all three, clean, balanced, with an impression of extended treble.
In my experience, bi-wiring only benefits speakers with large drivers and/or three way speakers with bass drive separate from midrange/tweeter (i.e. Vandersteen 2 and up). Also larger gauge does not mean better with lengths less than 10ft.
these are my impressions, i have left speakers in their positions between swaps and repeated trials.
i also have swapped the jumpers with 16gauge copper wires, not that i was expected anything but out of reading posts on that subject, and i could not hear any difference. The jumpers have good enough conductivity on such short distance to show 0 resistance, just like any other copper wire.