If you're starting this up again please abandon the old system. It didn't work for the audience we had.
Most of the complaints of the old system were that people had already read the book of the month. Which is pretty dumb when the selection of books is based on recommendations from the community. It defeats the purpose of, you know, reading the same book at the same time.
The community wants good books they haven't read before. That should be the only criteria. Give people fewer choices. Vote based on what you HAVEN'T read.