What you should see is if your crit % is average or not.

For instance, during the 2:40, you will get 3 Deathflares.

If for instance, all 3 do not crit, you've instantly lost 75 dps. Indeed, the chances of all 3 not critting are actually better than not.

Similarly, for Fester (though you do 3x as many festers, so it will equalize better to your average parse).