Since there is another Bingo derby tomorrow I thought I would reply with how my neighborhood handles bingo derby's. We start completing every task on the board. We leave the simple task (feed, eggs & milk) for lower level players. As we compmete spots on the board we trash all task we don't need. This means a few of us may have to take some long task (strawberries, wool). We try to hold off on the long task til Thursday.
There is a glitch that most people don't get lines counted towards their achievements but it does count for some. I got 1 line counted even though we got 3 lines.
There are some task that do not have 320 point task. I believe Harvest Seaseme on has 318 point task. So be aware of that.