You can't be lazy with sanitation. If I understand correctly, you racked from a carboy to a bucket. So your objective was to leave behind the yeast and trub, right? And I assume you rinsed that out of the carboy and now you have the typical ring around the carboy?
If so, then you need to soak/scrub that carboy until it is literally spotless and then sanitize it. Anything else, and you're very likely dooming the batch.
I never use the drill brush...just soaking and elbow grease...also buy another carboy
Remember you rinsed it out so it became un-sanitized at that point. Also, do you have it sealed or open to the air right now? No way I'd put my beer in an unsanitized carboy. YMMV. Cheers!