I don't have pace on the fitbit, but I run on a treadmill so it is even. I'm not sure how I can follow the program at the moment, unless I went back to week 5 or 6 again and try to progress again. My body seems to have hit it's limit on how long it will run continuously on a high heart rate without a break.
That is why I mentioned maybe going back and starting over except doing two sessions in a row. I am doing the hour of cardio pretty easily (I let myself dip into peak for a minute before slowing down), and so it would certainly be doable to do the early weeks twice. And hopefully when I get back to week 8 this time, I may again fit a brick wall, but maybe I would have improved enough to run the 28 mins straight once?