I think you may have missed a key bit of information
"I'm at anchor on my boat - the reason for the high speed and hand held is that the boat is bobbing up and down and swinging on the anchor. Perhaps I didn't make that clear."
Now it's clear as crystal!!! And the 1/60th second makes perfect sense.
"Speed - my torch/spotlight 1M candle watts was to bright and too directional to make the effect look right."
Gotcha! As is, the sailboat looks good.
"Did think of cropping so that just the sailboat was there - do you think that would work better?"
Definitely. Crop it to a vertical and eliminate the others.
Great job under difficult circumstances.