Good point on a back up. Will have to think how that works.
s for the other two bits... That's kinda the breaks in a random challenge. It has to be hard (or have the potential to be hard) as I want DQs to be part of it. I do want to celebrate the effort though. Maybe it's like the at least stones. If you reach each of the milestones you can say you've lifted that number of stones before you dropped out.
I'm going to be aiming for 0 organiser effort. Community enforcement and only check the scores of any finalists.