It sounds reasonable and I hope that it will bring a bit of control of that random downvoting around on Steem. As we humans are, if there is a new "toy" like downvote power people will use it, some of them clever and fair but some just because they want to spoil someones post and maybe just to annoy someone. I noticed that as there are many who just join the trail of Upvote even without looking what they upvoting do the same with downvotes and that is that may bring a lot of frustration. We sometimes rely on someone and do not check if it was right or not, therefore the suggestion from @fredrikaa about:

" show a feed of the posts you have downvoted with the too"

will have to have a chance to correct the decision made.

In my opinion I have thought those two features "Whitelist" and "Voting mechanism overhaul" would be great to be added first. I wish you good luck with the program, Martin and as always very constructive ideas from both of you!