There are not a lot of dofollow contextual backlinks. phpbio links, classipress, osclass, wpforo, bbpress, webboard, wordpress, xpress engine are the main ones for me. Sounds like you need to start scraping for new sites. Even forums have contextual do follows with keyword anchors like smf and datalife, so don't limit yourself to just article sites.
@sickseo what indexer service are you using now ? most of are not working and i wonder what are you using ? and what percentage you will get index your contextual or dofollow links ?Thanks