You have to turn off the "editor" when you are writing. It's great that you have both parts and they are good at their own time. Just tell yourself that you'll write an hour or a day or a week and not worry about accuracy. Then if you feel like doing so, at the end of the allotted time, turn your editor loose.

Oh, and be sure to keep the original untouched. In other words, save a copy and edit that. I've saved a lot of precious information that way.