Paragraph and word spin with no sentence level!

I'm currently spinning an article and have 3 rewrites for each paragraph. Do I really need to spin on sentence level? Or will moving on to word level be enough?

If you want to do the job well, spin on sentence and word level. Par level is just optional. It doesn't improve level of uniqueness as much as sentence level spinning.

Yeah, paragraph spinning doesn't really work.
I created 50 different introduction paragraph. Word spinned. Copyscape was able to detect one because I used it often. So copyscape will be able to detect future paragraphs once the word spin is used up.
However, the funny thing is that unique content with a backlink pointing to copied or duplicate content, will make the duplicate content rank up.