Hunter 410, Rocna 25 (kg), 200 ft chain that matched my factory windlasses gypsy, and 150' of rode.
When anchoring I normally use a 20' long dock line and tie a rolling hitch on the chain and bring it back to the starboard forward deck cleat and slack the chain considerably to work as a snubber and take all the strain off the windlass.
The boat still sails around a bit at anchor but there are no snatch loads and we never drag. Ideally I aim for 5:1 scope at high tide if there is room to swing. In the future I may consider keeping the helm hard to port or starboard rather than centred when anchored, and running a second snubber off the port bow cleat to act like a bridle. There are anchor sails that work well for this purpose too.
Before upgrading to a 70 pound anchor, be certain that both your windlass can lift it, and your bow roller can fit it. Rocna, Mantus, Sarca all seem to get good marks on forums for being quick setting and not dragging.