I see the course is not straight - so you'd be slightly faster if it was. Also, you can see your heart rate rises then flattens off and drops slightly at max effort, which is perfect. That's massive progress .
Of course it means you need new paces....
For this week, stick with an hour easy today and 16k LSR comfortable pace Sunday, and I'll post next week's plan a little later.
JJ,, I certainly think you are fine to RUN it, racing full on would be counter-productive. But treating it as a long hard run we can manage. Might be quite useful as longer distance pacing practice for the main event later in the year. You already have the endurance to cover the distance.