Hi,
I have made to use some other color to the logo like you ask, but I can not submit it ... because it's on the the judging time.
Just to inform you. While your contest is in judging mode, only the first ranked designer can upload designs due to technical limitations. if you want to ask for changes for any designer you'll need to temporarily rank those designers in first place to allow for the upload...
Best Regards,
Arip