I got 5% from public events. Doesn't matter whether they were Heroic or not. Not sure what's going on with you.
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I did do a heroic public events and didn't see the value increase at all. Like it had glitches.
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I completed it today. I actually got 3% for regular, 5% for Heroic, and 5% for lost sectors. On a completely separate note, I've noticed that I'm not getting % credit for Nightmare Containments. Could be a bug with their counters.