Dear Peter,
First of all congratulations your Airbnb listings are Amazing with great reviews.
Don t be discouraged about the occupancy, i know that it s had sometimes i m too.
Remember Always that you don t have to be the cheapest in order to get bookings but potential guests have to choice you because your properties give a unique experience respect of other property on Airbnb of this area.
I suggest you to focus more on a mix between emotional and detailed description of your place, highlights the many caratheristics that make your potential guests stay memorable.
I love your photos but enphasize but i suggest you to put descriptions on every photos of your listings.
Speak more about your space in the listings with all the amenities you offer.
If you want instead of reducing the price near to the date, put Airbnb promotions of the 20% off in some days of the month and see what happen.
Search constantly how you appear and take constantly action to your listings description or change sometimes the cover photo, this will also move the algoritm of Airbnb.
This are my personal opinion and suggestions than of course i don t know your area.
Best regards
Andrea