Sikiguya,
Old sailors will confirm.... this is not an anchor which holds.. this is a chain which holds ground... anchor only holds the chain..
there was a good practie to have at least 2-3 mtrs of chain between your line and anchor and weight of that chain kept the line closer to the bottom, anchor rod will be lying on the bottom and anchor will be more efficient.
this works for recreational boats as well as for heavyweight supertankers..
Do not make your anchor line/chain to tight.. you will lift the anchor rod, anchor will be up and you will be dragging.. In normal conditions you should use lenght of the line egual to 4 to 5 times water depth (water depth 5 meters - use at least 20 meters of anchor line)
Usually when there is strong current or wind it is necessary to pay out more of the anchor line... same if you ride heavier boat..
This always worked during my 25 years of seapractise as a navigator.. and I hope it will work for you as well
DeWalMar
... one more thing.. try to lie your line along the current or wind.. do not stack it in one bundle on the bottom