It could be that the acorns are falling in your area and they are staying in the woods. You need to get further back in the woods towards the bedding areas? But not too close.
Or it could be that they are holding out until after dark when it cools down to come out.
Or it could be they are staying close to water like you posted in your message?
If you have a trail camera put it on a tree back in the woods somewhere and try to find them with the trail camera. Thepictures will tell you what time they are moving thru the area.
You have to move around and find them.
Hope this helps!!