If you watched the first 2 pass DDG made with the Demon, those are two excellent examples of what the wrong clutch for what you are using it for does. Note: wined it up dump clutch big bog,roll away at almost idle till the RPM's decide to come back up.
If you watched DDG's video when he was getting the Demon ready before he left Washington state, he installed a new CenterForce clutch. Third pass there goes the ring and pinion, oh how I hate CenterForce clutches. They just love to brake drive line parts.