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I've looked at your homepage and the copy is presented in big paragraphs which is definitely not easy to skim. I think you should divide your copy into small segments so that users can get the information quickly. Check out Moz homepage for a good example.

With regard to the scorecard from Yoast, I wouldn't worry much about it. It will give you the "green" light if you have keywords in your content. To me user experience is more important than having overly optimized content. The problem with focusing on scorecards like Yoast is that you could end up stuffing keywords into the copy instead of providing a readable, useful, and informative content to users. I hope this helps

Hi Alec, recovering from a Google penalty is not an easy process unfortunately. And the Q&A section here wouldn't be enough to explain everything as well. I would suggest going over this article on Moz. It is a very thorough article explaining every steps you need to take to remove manual penalties associated with your website. I hope this helps

Hi Fernando, though you have WordPress files inside "example.com/folder", you can set your domain to be "example.com". I think it doesn't matter where you installed WordPress as long as your address is "example.com". And of course, you must be doing your SEO on "example.com".

I think it is more of a WordPress installation issue than an SEO one. You can read more about it here - http://codex.wordpress.org/Giving_WordPress_Its_Own_Directory. I hope this helps.