slayton

I'm guessing the dismount difficulty was intentional. The difficulty of the Metal Spin in Japan is in trying to hold onto the chain; you either hold onto it and stay out of the water, or you slip off and fly into the water. The only time that holding onto the chain was a challenge in Vegas was in season 4. Everyone who has attempted the Metal Spin in Vegas in seasons 5 & 6 has been able to hold onto the chain, even if they're touching the water because the chains in Vegas are too long.

ANW runs stage 1 the first day, and the other stages a day later. Only SASUKE usually runs all 4 stages in a single day.