Thanks, all, for the comments.
Re the lens, for a number of reasons, I gave up a Zeiss 100mm prime and picked up a Nikon 70-200 VR II. Still wondering if I did the right thing.....
Re different viewpoints, I was restricted by water in front, construction site to the left and bushes to the right so this was just about it.
Re the wind whistling through the cables, this is the bridge where a couple months ago, ice bombs fell onto over 100 commuters driving under the cables. I think they heard the wind whistling as well, but not in a good way.