the pva string coupling together some large loops can work and add the pva foam will give you that added confidence to ensure the bait heads upwards straight away once in the water albeit i acknowledge long distance casting can be tricky with a zig. Re people not having had much luck with zigs I have clearly been very lucky - i find on a warmish day, a zig rig with a cloudy spod mix over the top can produce some fun fishing as the fish enter the cloud of spod mix and find your zigged hookbait floating amongst it....