Dale, This might be silly, and more work than is necessary, but could you run a wide plank through your table saw on edge, flip it, run it through on the opposite edge. That wouldn't get you all the way through the plank, but it might help the band saw to track better as it cuts through the middle section.
Just a thought. -- Blue skies. Dan Rossi Carnegie Mellon University. E-Mail: [EMAIL PROTECTED] Tel: (412) 268-9081