On second thought, the percents you are seeing could be the curate rewards @ned would get on your post if it became popular. He must have upvoted it really early on, so he'd only get 1% of his potential curate rewards for the upvote. On the post where he gets 40%, he probably voted for it about 12 or 13 minutes into it, so he would get more reward. There is a penalty on percent curation rewards you get if you upvote within the first half hour. It drops to zero after the first half hour is past.
That doesn't explain why you only get a Dollar for his upvote, though, when he's at nearly 100% of his voting power.
I think something's not working right with the system here, or there is an additional variable I have yet to learn.