Sorry to hear the fishing was tuff for you yesterday.
I was also out for the evening bite in approximately the same places as you were too, although not so far north. I found VERY LARGE schools in 3 places.
Some schools would scatter fairly quick, others lingered around much longer, but I was able to pick off a few from every school I fished.
I had a great day yesterday for numbers but the sizes were a bit small.
I took some screen capture shots and they are still on my Lowrance. The one below is from my cell phone as I was rubbing it in my brothers face I was on some serious fish while he was not

Some days they bite, some days they dont. Sept 1 was my day I suppose.