The red assigned didn't really match our banner so we wanted black It sucks too that the banners get mirrored like that haha, if only it were fixable. Is there a possibility we could use a different red that isn't taken that we could use to match our banner?
Just provide us with a mirrored banner, so it gets fixed when mirrored again. Or ask Kalam to do it for you ;)
About the back colour, just test the untaken banners ingame, you will find a slot that matches, Kalam switching trough until you are pleased takes too long. Get 2 guys on the duel server, one to cycle trough banners, one to stand there afk with your banner, and compare colours (For example look at our SeaRaider banner, back colour is a different shade of blue, yet it matches on the rare occasions we wear heraldic)