I have several spun articles, well-written and proofread, but which are 70%-90% "original" (unique) content. In other words, they won't pass Copyscape. When I've submitted anything less than 100% original/unique to content mills like Yahoo!/AC, they're rejected. So, what do I do with these articles? Should I spend more time on them to make them 100% unique -- or what? Any suggestions? Thanks in advance!