Would Google see these links at the end of my blog as spam?

Please excuse me, but my terminology with certain things is off. I believe I'm referring to anchor links (internal linking).

I have a site where I sell a downloadable e-book with sex advice. It's not typical cheesy scam products, and I've received great feedback on it. It works. I've done pretty well in the past, but have experienced a slow drop in visits and sales since Panda/Penguin, until now-a-days... now it's just in critical condition.

I have a main site, for instance www.mainsite.com, and then a wordpress blog attached to it, for instance www.mainsite.com/blog. Each blog post generates it's own individual url as well, with the blog title in the name.

At the end of each blog posting, I lead to the corresponding page on my main site (I cover about 5 main topics = lasting longer, overcoming ED naturally, boosting drive, etc.).

The end of my blog post will look something like this (the bold part is the link to the corresponding sales page, but I don't put it in bold):

For more more ways to naturally increase sex drive, click here: [B]Natural Ways To Boost Libido in Men/B]

Something like that. The rest of the blog isn't so packed with keywords. The content is always unique (to the best of my abilities) and offers some practical advice (and honestly, I worry more about the message than packing it with keywords).

Here's the thing, I have written personally over 1,000 blog posts. If I have to go back in there and change it somehow, it will be a MISSION. Do you think it's fine as is and can leave it alone? Or can be seen as spam?

And if so, how should I change? Thanks

P.S. reason I'm asking is because I was recently hit with a manual spam action for violating "quality guidelines"