Re: Mooring ball too close?
I've had my boat wrap up with another which was too close on an adjacent mooring. When this happened, I was in a tidal river with strong currents. When wind and current are running opposite directions, the boats would not all swing together. That's when the trouble starts. Many of the boats towed a bucket or something to create drag, insuring the tide would win the argument with the wind, but this was not fool proof.
If you are in a bay with little or no currents, you can get away with being very close to similar boats that swing together. In some of the local harbors on Cape Cod, the moorings are very close and there are few problems. Tidal range is small as are currents.
If you are in a river, or an estuary with strong tidal currents, you want lots of space. And if you intend on riding out a storm with some surge, you'd like some ability to add scope to your pennant. In these cases, we'd ask to move.