Never got a woodcock, but it is high on my wish list.
Grouse hunting is what got me started in hunting and I always go up for them opening day and at least one other time. Not sure about this year due to when the dates fall and EOM activities at work but I will make it up at least once.
I usually go farther up north than the area you are looking for but I have seen them everywhere (even in Manchester, which was a nice surprise).
All are personal observations...
-Grouse need to eat pebbles for their crop to crush seeds, so they are often found near trails picking up rocks early in the morning.
-Find their food sources and you will find them. If its a nice source, there will probably be a few in the area not just one. They eat a big variety of seeds/berries.
-My top spot for grouse is actually a very wet area, so do not dismiss an area if it is a little swampy in some spots.
-They also need rocks/stumps to sit on and drum early in the year. From what I see, they do not go far come the fall.
-If the weather is crappy, they may be in the trees, which can be disappointing as for me, the flush of the grouse is the absolute best part, even if I miss.
-Logging is good for grouse. Areas logged in the not so distant past that have started to come back often have the kinds of bushes/trees that provide grouse cover and food.
Hope that helps you find some grouse!