Feral Bleeds

I know a long time ago rend, the arms warrior bleed, was changed to being a rolling dot. This means that if you reapplied rend before the duration was up the remaining damage was added to the new dot. Do feral bleeds work in a similar fashion? And I guess more generally I am having difficulty finding a build/rotation that works for me. Presently I am using jagged wounds, Savage roar, and moment of clarity. I keep Savage roar up. Should I just keep applying rip and alternate between rip and ferocious bite? Or just keep ripping until I get the target below execute range and then just ferocious bite? I find it hard to break 500k dps. I have like 889 ilvl.