I'm sorry that it has been so tough right now. From my experience, it worked better for us if we did not keep our routine by the clock. We had better days when I was more consistant about the time between wake, feed, activities, etc. So, if John woke at 7:00 and needed 2 hours before a nap, he would nap at 9. But if he woke at 6, I would put him down around 8. Trying to wait that last hour was miserable sometimes.
More than anyting, I would suggest watching for the sleep and hunger cues and following them. You may in a growth spurt or close to one, and things tend to go haywire then.