If you take out the avoid work command on that bid group, it will never fail. It puts every trip into the pool...it just prioritized them using the L-- vs the L-.
Are you a commuter? I didn't care what days I worked and I wasn't concerned with finish times because I drove to work. This bid would typically be a Thursday afternoon starting four day that paid 20-22 hours and Finished Sunday night at 2100. The schedules were very consistent.