Thanks Matt. You pretty much said what I was thinking! It was a frustrating target! Made all the more frustrating by the fact that the plan I put together, I believe would have moved the needle but very quickly, being a small business, we have to shift to work on whatever is the most important thing right now!
We're in a niche where our DA fluctuates between 40 - 50 and we are pretty much always above our competitors by a good way.
Our target was 60+ actually and I think we possibly could achieve it (or at least move towards it) if we had the time and skills to do better link building (as described by Peter below) and basically, as I've heard Rand say on numerous occasions, simply do better marketing ; )