Get you one of those thermal imaging scopes or NV scopes. If you want to save the coin you can get a good spotlight at any outdoors store. That last one is an old south tradition, that has been tested by time and stood up to the challenge.
In all honesty IDK the answer. I think you are doing it right and that is what I do most of the time. I hunt a small property that is not the core area of any of the bucks in the area and I just have to see what shows up in November and then hope a hot doe brings him by. There isn't much else I can do.
If I had a larger property where big bucks actually bedded from time to time, I would probably try to hunt the edge of the bedding area.