I noticed there were problems enforcing the rule that one write something to support their votes and people constantly reminding offending posters.
Here's my suggestion: if you choose to write nothing with your picks, you only get a single kill vote. No second kill, no save. If a person insists on listing two kills and a save, the second kill and the one save still don't count. If we want to be a bit crueler, the one kill can count as half a normal vote (0.5), really drive the point home that drive-by posts are worth much less to the thread.
Only individuals who write a couple of short sentences that say something about all three picks have their full votes counted. Copying and pasting from one of your previous posts should be acceptable if your voting is identical. Shouldn't always have to come up with something new to say.