I completed Presage twice with the modifiers set to an A score. Finished the mission with minutes left on the timer and didn’t get an A. Same thing happened to me doing Encore last week. Please look at this, it has to be a bug.
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Can confirm, I just finished with like 12 minutes left with almost maxed modifiers and it gave me C. Honestly until such time as they can actually get their game to work properly they should just make everything give A+ rewards. Obviously it's not a great solution but since the alternative of, you know, [i]having a functional game[/i] is off the table we make do with what we have.