I also use Blogger and PLR articles and till now the results are not so good,but I just continue doing my job.My advice:
1.Spun the articles as much as you can.
2.Check the keyword density and make it 2-3%-this is a must
3.Start building backlinks:
-find related forums
-write articles-Squidoo,Hub and etc.
-try to find blogs to comment on-take your time and leave good comments.
4.Do onpage SEO:
-add tags
-change the structure-blog/title shoud be title/blog-you will have better chance for longtail keywords
5.Add privacy page,about page and contact page-a must if you use adcent

6.Use some seo tools-plenty here in the forum
7.Don't give up if you don't see any results immediately-health niche is overcrowded.
8.Pray
9.Seek advice here if something is too complicated for you.
10.Have fun.