HI @anusha2,
Welcome to the community,
For your 1st question, yes Form Extractors aren’t up to the mark yet when it comes to extracting Tabular Data. You can go for Regex Extractors, if your tabular data more or less remains the same in most of your documents.
For your 2nd question, I would follow @corinna.robertson’s advice and check the output of the OCR activity (and change OCRs if needed)
Thanks,
Nishant