SEO Issue?

Hey Warriors,

I have a couple quick questions...

I am running a website that, in spite of incredible, unique content, is still have troubles being found on Google. My main site "In Just 10 Pages" is number one but I am currently focusing on the keyword "gluten intolerance". I'm having some success with long-tail keywords, but not with my main keyword; 'gluten intolerance' and have been hovering around page 5 or 6 for this desired keyword.

Question #1: Is Google having trouble finding my site because my 'gluten intolerance blog' is in a sub directory of the url?

Here is my sites link: Gluten Intolerance | Gluten Sensitivity (GS) - In Just 10 Pages

I am trying to start an entire brand and have started with one 'niche market'.

Question #2: Does the age of my site really matter that much? It's been around for a year and I've constantly been updating content.

Question #3: Is backlinking the problem? I'm doing everything 'white hat' and according to Alexa have about 116 links.

The long and short is... Should I continue to focus on this niche or continue on with the next and let time run its course....

Thanks in advance!

Conrad