i have been using spiderwire stealth since in came out and my whiplash stock ran out. i really like it! after a trip or two, it feels very similar to whiplash. the two spools of PP i tried both had way too many mysterious breaks for my liking.
as far as knots, i have been using a trilen knot since i started using braid and it has never loostened up on me.
TRILEN KNOT