It's tough to have a timeline!
We have been in the same situation. It's tough when you want to take the time and enjoy the area you are in and there are so many worthwhile caches. You'll figure it out.
Just to add fuel to the fire, on your trip down Rt 1, if you decide to take a coastal detour through Jonesport via Rt. 187 and it is mealtime, there is a great local eatery named Tall Barneys. There are only a few caches along that route, and they probably don't warrant the detour alone, but Jonesport is a great example of Maine fishing town. But it doesn't hurt to add the eatery to your list just in case.