I think that was a creative solution. Try changing the colors so the blue is more royal blue and the green a bit darker and see if that does better. another idea is to use the same color for the "O" and the "C" in the name OpptiCorps and in the O and C in the inner circle. so the association is more readily apparent.
I still think #28 is the best of all these efforts. I like the font and the concept. The issue is how we make it look better. Try a green darker green instead of your yellow-green. The tulips on the side aren't exactly right. Try a fleur-de-lis.