I agree with post #6, simply add a boost to the 30/30 unit, say 10% Alliance boost A&D.
I don't think Gree can fix what happened. They also cannot repay everyone. It's more than gems, but time and effort. Not only on the quest but away from trials (that the others got to work on, while we quested)
If a boost is too difficult, then modify the 30/30 stats by 15x. A 500+ mil unit is about the same as the original prize.