Hi @vandeberg, thanks for taking the time to explain the proposed downvote pool.
Downvotes will be taken from the downvote pool first, and then the upvote pool once the downvote pool has been consumed.
When would the downvote pool be considered consumed? If it operates like voting power, it will decrease as a percentage of existing vote power i.e. 2% reduction at 100% VP and 1% reduction at 50%. Therefore, we will have very tiny downvotes before we start consuming the voting pool/power.
Alternatively, I was thinking maybe downvotes just come from a downvote pool and not at all from the upvote pool. This would limit abuse but provide incentive for at least some downvoting. In this case you could increase it to a bit higher than 25% of the upvote pool.