Yes you can get too much magnification in a binocular. In fact it is a pretty common mistake that people make in thinking more is better. There is a reason why the vast majority of binoculars for general purpose viewing are typically 8-10x. The image will be brighter at those levels, the glass will be smaller, the field of view larger, and the lower power is much easier to hold steady.
You enter a whole new world when you hit 12-15x. That is usually way too much for most people to even remotely hold steady by hand. Put it on a tripod, where it belongs at that level of magnification, and you will start to see things that will remind why high magnification has its place.
Comparing lower 8-10x glass with 15x or so and the comparison really becomes more apples to oranges. 15x optics are different tools than 8-10x optics and will have different uses.
I would say 15x is way too much for the woods distances.
