100% centurion is worth it, first high is receiving basic approval, the next high EIB approval and top that off with another high of centurion approval, to know you have achieved the highest level of TK armor, it's a thrill.
Polish should take the scratch out, if not you may need to use wet and dry sandpaper, use soapy water and go from 300 grit through to 1200 grit then polish