No. Not at all. I've seen 1st character 29s do better than alot of 32s I play with. I also know alot of 32s with level 25-29 characters, who can't join because they're lower than 30, although they have a maxed Fatebringer, or vision (or any other Oracle disruption weapon). I would prefer to take a 29 through VoG than a 32. They only do like 10% less damage. A 32 does no more damage than a 30.
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Higher levels always do extra dmg but, it's very small amounts. As I already said, you're talking about the minority.
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No. A 32 does no more damage than a 30. They take a little less from a 30 though, but it's hardly noticable. I'm not talking about the minority. I have NEVER had a problem with low levels in raids. I've had more problems with the higher levels dying and saying "it because we have a 29 in here with us" always.