There is a big limit on how much importance G can give to fresh content. Not every site is a news site or blog. Static sites play a huge role on the internet. Good content is more important. I have many sites in similar competition niches ranking better with 1 to 5 pages of great content with perfect keyword density than my sites with dozens or hundreds of pages of high quality spun content, and outsourced unique articles. The time is better spent on offsite seo. And also, with a lot of you, you're writing article after article with the same keywords in it. You're more likely to get a penalty for this than increased SERPs. If you're targeting a different keyword in each article, then that's fine.