I know that sounds a little bit stupid but: In a way going faster makes things easier. I recently improved my 5k record by a couple minutes (sub 22) and when I compare it to me 2 years ago it is in a way easier, because I only need to run at my peak speed for less time. I am sure with time you will have a similair experience.

But in general if the ending is hard and the beginning easy then you should start/run at a slower pace at least a couple times on this distance.