If you are having problems scraping URLs that actually contain your keywords like I was (posted bout it earlier in here), you can use this free tool over at WTF to extract only the URLs from your scraped list that contain your keyword
I can't post the URL, even in code and many keywords bleeped out. PM me if you want it.
Once I started getting valid URLs, my success rate started improving.
I also use real names in my comments rather than anchor text. I think this helps vs using something like "My Keyword Phrase". As a blog owner myself, I always check URL, Name and Comment when validating any Wordpress comments. If something looks like spam in either of those three places (such as a name that isn't really a name but a keyword), I either spam it or remove the URL from the comment. Something to ponder when you scrape/submit.