Decoy help

[C-Bass2mouth]

We have a big problem with losing decoys after a good storm. We put out 2-500 hundred with some painted 2 liters in the mix. We mix quick-crete and fill styrofoam coffe cups up and put a good size staple in them to tie to for an anchor. They usually hold good in the marsh mud, but swells gradually move them across the lake or the line breaks eventually. Anyone have any suggestions or experience with this? And no I'm not picking them up after every hunt. Thanks for any input.