Interval training 1200m x 4

I must be crazy. I had my 2nd interval training within the week. Maybe I am trying to compensate for the shorter than expected mid-week LSD. This time, I try a longer distance of 1200m x 4, same 3 mins rest, target pace at 5:15.

But I am not able to keep the 5:15 pace. The 4 splits are 5:16, 5:05, 5:27, 5:26. Need more training...