Interval training 800m x 6

I missed a weekend LSD and back on my weekly interval. 800m x 6, 3 mins rest, 5:15 target pace.


However, other than the first three splits, I drift to 5:30 then 5:45 pace. With just 1.5 weeks away, I am drifting off my form... My peak possibly has occurred a few weeks ago already...