It depends, I had a group of 31+ that did it 3rd try and in 2 portals. Yet I had a group of a 29, a few 30s and 31s and it was 2hours+ of wipes on Atheon because they had trouble with oracles (like wtf?), I had to drop relic to help them then pick it back up and repeat (as you said you do no more damage above level 30; excluding abilities, those do more, so I was VERY -blam!-ing confused as to why they had problems).
TLDR; I've had bad experiences with 29s and 30s in HM VoG. But I do try and help them when I can (be it I'm wasting my time often).
Edit: Personally I don't know how people even manage to -blam!- up on VoG, supplicant explodes or a bug then sure but in reality both should be rare occurences and it should take 3 tries max.
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You were just playing major noobs.
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It's better to use your special with the relic rather than dropping it to shot a few rounds.
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No, like I can't shoot it every other oracle, they really were doing borderline NOTHING, I used my Jolder's hammer to shred them
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I always have my intellect maxed, so that probably helps me out. I smash atleast 2-3 a run. You can jump snag them also! Very helpful.
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Dropping it and wrecking face = less risk of diving off map
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Or you can learn to not jump to your max and that wouldn't occur. Practice makes perfect.
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I use blink, it's better and the people killing oracles should be doing their job properly in the first place