It looks like all your characters are uppercase, but if that is not always the case, my experience with doing per character ocr in tesseract is it cannot handle capitalization properly. That is, is it a 'c' or a 'C'?
I layout all my characters in a straight line, and get much better results using PSM line mode. -- You received this message because you are subscribed to the Google Groups "tesseract-ocr" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/tesseract-ocr. To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/a9021c8c-22d0-494d-9b92-27beb071f5f5%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.

