So yeah same story, I don't think it's colour related with the Zeus x. I have a black Zeus x and it was flooding because I didn't wick it correctly. I only have black tanks.black zeus X that's prone to flooding.
had a black sm25 ages ago that had similar problems and only buy SS rta from then on.
You just have to get the sweet spot with the amount of cotton to use, the tail thinning and length of the tails. Not all tanks like to be wicked the same way so just play around with the wicking and take your time.