Hi skyhoo,
there is a sweet spot in every PhD, when you feel that your PhD is stupid, any child in the nursery school could have done it better, and that there is still so much one could write about the topic. There are still so many ways the data could be analysed, there are new models that can be created. Ah! The joys of being a young researcher!
So, listen to me: WRAP IT UP. Stop reading, stop doing further analysis. Just write what you know so far. If you have time, polish it at the end. PhDs don't finish, they are abandoned. Enough is enough at some point, and there is real life out there (or at least this is what other people say).