IMO bad choice Kansas Flier. Kevlar lines should not be used at all if is another kite in air and under any circumstances for laundry. at most of the festivals people using Kevlar lines are reported and are some actions against them.i hope Kevlar line is broad in discussion just for comparative purpose. best choices is braided line no mater how big or small is the strength and never use twisted lines (if you want to be a serious kilter) . the strongest kite point should be the anchor follow up by the line and like on fishing kite is the weakest. if the line break try to imagine what happen to the people caught in drag of a louse kite at just 10 mph, not to nice to see and trust me your insurance will not be happy
HedgerowPete about what "large kites" you ask ? delta, power sled, box ,winged box ?