The PM shift can be a great time for fishing. It is usually a little bit more windy and the parking can be horrendous. I personally have had good luck with PM shifts, but sometimes the bite is better in the AM, (the parking sure is).
I haven't figured out why the PM shift is better sometimes, and the AM better others.
I am a General Contractor so my work often keeps me from being able to fish in the AM. But I don't mind because, as soon as I fight through all the touristas, it's a picture perfect place to enjoy the sunset doing what I love! And landing in the dark is a lot more fun when you can't see what's coming in next!