Hi mate,
I tend to use a figure of eight knot at one end connected to a quick link swivel and to the hook either tie a grinner knot and blob the tag end or knotless knot to a stiff hair. When tying flurocarbon hooklengths tension must be maintained whilst you are creating the knots otherwise it can "spring" off! Also moisten the knots well before you bed them down. Hope that helps.