The lack of sun is a problem, Geof, so now I understand why you don't get as many blooms as possible. I'd have thought that 6 to 7 hours would be enough but you have the experience.
I agree, not much you can do about the neighbor's tree.
As I went to sleep I heard the rain and heard it again during the night, so I figured we miraculously avoided the snow: wrong! When I opened the shade I was more than disappointed to see the snow falling and it's due to continue all day long.