A bit off-topic, procrastination vs. focus is a very different problem (imo), but try the "Strict Pomodoro" Chrome Extension, has helped me improve quite a bit.
Don't you get interrupted while in the zone? 25 minutes is about the time you actually get deep into something and the mind can easily focus 1-2 hours on task at hand, especially if you do something interesting.
Yes, good point. I often find myself ignoring the "pause" notification. I use it more as a take-off.