Earning Prestige
The only thing that affects personal prestige earning is your level, up to level 25, and the the Day Job "Monitor Duty" which adds prestige to mission complete bonuses.
ParagonWiki Prestige page.
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"Chew Electric Death, Snarling Cur!"

I did some further research and discovered the problem - grouping. I was not aware of the fact that grouping can seriously impact the amount of prestige being earned vs. fighting solo.
That being said, I still think that the prestige award amounts in groups may be bugged. It almost seems like if a player is not in SG mode, his or her influence earned is not included in the total for the prestige pool but is still counted when the prestige is divided amongst the team.
I would be very interested if someone with lots of friends could research this.
What are all of the factors than can affect how much prestige is earned by a character in SG mode?
The reason I ask the question is that I have noticed a dramatic decrease in the amount of prestige being earned by my characters in an SG on Freedom, regardless of the level of the character. Meanwhile, my characters on another server are earning more prestige in SG mode doing the same actions.
1. Does the size of an SG affect how much prestige can be earned in SG mode?
2. Does rank within the SG affect how much prestige can be earned in SG mode?
3. Is there a decrease in prestige earnings based on how much prestige an SG has already earned?
I am really perplexed and concerned. My SG group on Freedom is trying to expand our base and I need to know how to maximize prestige earnings or discover if my characters on Freedom are somehow bugged and not earning the prestige due to them.
Thanks in advance for any answers or suggestions!