Not sure, I couldn't explain it anymore than what it says here (on the 'how is it calculated' link from our profile URLs):
http://ssd-life.com/eng/how.html
It suggests that we can all expect ours to decrease from 100 to 0 health as the drives are used.
I also suspect that with a smaller drive, you're going to re-writing to the same locations at a higher frequency than I would with a larger drive, as (for as long as the drive isn't full or that the quantity of writes isn't proportional to the drive's size,) it has much more freedom for where to spread the effort to.
According to your data writes, you've at a minimum likely written to every location on the disk at least 10x, and since some of those locations may have only been written to once, you may find there are others that have been written to (potentially) a few orders of magnitude more. By comparison, in my case, I've written 500GB to a 240GB drive so I may have only written on average to each location twice, and my drive is only half full at the moment so there's plenty of slack.
If it drops lower quickly, and it is still in warranty, I would be sure to contact OCZ or where you bought it for a possible RMA as it might be faulty.
Hard to say with SMART data alone though, as it is apparently somewhat subjective in its predictions. Make sure you don't have defrag scheduled for your drive (defrag SHOULD be scheduled, but it shouldn't be including your SSD in the schedule), that's all I can suggest to look at which may be further accelerating your disk write rate.