My buddy does the same as you. They start early and finish early. 
They make some that’s almost as clear as moonshine. Quit as soon as it starts to darken. I haven’t seen him lately so I’m guessing he is still in the woods. From my understanding as soon as the buds start swelling up the color goes. 
I asked him about that and he said the same. It’s really just a preference of his but he thinks it’s the best syrup.
Bjrogg