Around here, this time of year, the White Pines are dropping their needles heavy. Plus the leaves all falling, bet the previous owner never raked, or used a leaf blower on his roof. Probably the leaves and needles could lay pretty heavy on this roof in your situation.
See no gutters to unclog....
Would like to see a pic of the attic where the insulation meets the bottom of the roof line inside. Just wondering if enough air is comming up through the facia? Or if the insulation is cutting it off.
Maybe more roof vents, coupalo to get the air circulating better than what you have going on.
Curious on sump pump, check on discharge pipe and see if it is running all the time or not.
Need picture of your fireplace. ;-)
Good luck, looks nice. Think I could see a few deer out back in the woods. ;-)