And because "Google is really becoming fussy with quality of content" you spin your article 50 times...I believe you should get one good article written by a writer or by yourself. Then use Article spinner to make 50 unique copies of it. Use it.
If I were you I would have written the article by myself. For non English speaking people, You should invest in good quality content from a reputable writer. Google is really becoming fussy with quality of content over time.
Regards,
Pk.