John,
One other thing that I thought of: you mentioned that you kerf first using the dozuki. The dozuki has a thinner kerf than the ryoba and that might be causing the issue. Try using one saw or the other, avoid swapping, and do use crosscut teeth for crosscutting and rip teeth for ripping. I know than Japanese technique does not include establishment of a knife wall but I believe that if you try that it would help.
Have fun