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Yeah, most of my traffic was already longtail as well so I was interested to see how that would work out. If you already get a lot of longtail traffic you'll probably see what I'm seeing: a ton of keyword suggestions that look similar what you already rank for but is actually different. It's totally worth going after those terms.

Re writing service: I haven't used the blog writing service since I already had a couple of writers that I was working with so I just had them focus on HitTail terms.

Yep, I'm a HitTail user. It's worked great for identifying easy to rank for longtail keywords that I can go after. I'm currently getting about 1,700 monthly uniques based off around 30 articles that were written to target HitTail suggestions. Not a huge amount of traffic but I'm very happy with the results considering what it cost me to have the articles written and that the traffic converts around the same as other organic traffic I'm getting.