My recommendation. If you can't seem to get over the time hump, spending a couple weeks at the plan for week 4. Instead, try increasing your pace gradually. After a couple weeks, go back and try week 5 at your old pace. Your body will appreciate the slower pace and the extra time should be easier.
I started C25K back in 2012 and in about 8-9 months I was able to run a full 1/2 marathon without walking. I have not ran much now for the past 3 years and I am about to start the C210K today. I have tried to start running again the past few years but can't past the soreness. I am hoping starting from the basics will build me back into the swing of things. Wish me luck!