The channels at the top of your tvfool report are extremely strong, so you shouldn't be having any kind of trouble with signals being too weak. With signals at these levels, you could probably pick them up with just a paper clip!
It sounds like the blowing trees might be causing moving multipath that is making things difficult for your receiver. TV signals do bounce off of trees, and if they start moving, this can cause the signal after-images to move around. This makes it quite hard for the receiver to lock on to the digital data stream and produce a picture.
Your current antenna is probably somewhat directional. The first thing I would try is to re-aim the antenna. A directional antenna might be able to pick out a cleaner signal path that is not disturbed as much by the blowing trees. The signals are bouncing all over the environment (hills, buildings, trees, etc.) and the "cleanest" path might not always be the one with the antenna pointed straight at the transmitters. Your sensitive area in front of your antenna is probably about 60 degrees wide, and if you can use that to isolate a clean signal path, it will make it easier for your receiver to stay locked onto the channel.
I'd recommend taking a compass up into the attic for a visual inspection and start with the antenna pointed straight at the Boston stations (around compass heading 210 degrees). If you notice channels having a hard time maintaining channel lock, try turning the antenna away from that heading in small increments (do at least one channel change each time you move the antenna). Use the antenna rotator so that you don't need to keep going to the attic. See if the channels gain any stability.
It will take a bit of trial and error, but this might help you find the "sweet spot" that gives you the best stability across most channels without having to change any of the equipment you already have.
If none of this helps, you may want to try a different receiver for testing. The ability of a receiver to deal with multipath depends on how well their equalizer (multipath canceling circuitry) is designed. Equalizer quality can vary a lot, so one receiver might handle the situation a lot better than another. If you can borrow a converter box or some other receiver for testing, you might see if one device does any better than the other.
What is the make/model of the receiver you are using now?
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