Does anyone know if Izorline XXX sinks like fluorocarbon or floats like mono? Since it's a copolymer, is the sink rate in between mono and fluorocarbon? Does anyone know if the sink rate for Izorline XXX is similar or close to Yozuri Hybrid when comparing the same LB test? 

I would guess most co-polymers are like YZH and therefore “neutrally buoyant.” I have watched my jerkbait depth on Livescope and have used both YZH and Invizx fluoro and they are about the same depth. YZH maybe retrieves a little higher in the water column (6-12 inches higher?) but that may be as much due to the fact it is a slightly thicker diameter line (.010 vs. .011).