I'm having a really bad time trying to resaw. Doesn't seem to matter whether it's cherry or poplar and whether the width is 4", or 5", or more. And I'm only trying to split 4/4 wood in half. I finish all four sides of the wood, set up the band saw with a relatively new 1/2", 3 TPI blade which has seen limited use to this point, set the tension using the flutter test recommended by Timberwolf, set the fence to correct for drift, and have at it. The problem is that after the first few inches of the cut going well, the cut begins to curve inside the wood producing one side with a concave side and one with the matching convex. I'd appreciate any thoughts and advice. Thank you for your help.