Limit the days things can be submitted on and voted on. Submission only (no voting) from Sunday night to dom end time. As part of dom rollover, turn on voting and turn off submissions.

Each day Wed-Sun, give each person x up and x down votes (20?), which can be banked for that week (so you could save all 80 for Sunday if you want).

To make this work you’d have to remove the random display of entries. Instead, let us filter whichever we choose into “yes”, “no”, “probably”, “probably not” and “meh” buckets, and up/downvote from those only.

Dom players might like this too, as they can strategically plan their chocolate — no you or someone else getting surprise chocolate after Sunday (except via Itembuildr).