The voting is one issue but the other issue (and the reason I think the back and forth low voting goes on) is the commenting. There's nothing worse than doing your best work, making your submission and then having somebody tear your work apart right on your entry for everyone to read and while the contest is still going on. It's just too easy to sway other peoples voting score with negative comments. The fact that you can see comments on every entry before you vote doesn't help either. I'm not looking to hear peoples opinions on my submissions I just want to enter and see if I win. All the snarky comments and wise ass remarks about peoples work right on their submissions as the contest is unfolding is in my opinion what's causing all the problems.Perhaps you should not be able to comment until the contest is over or at the very least your comments should only be able to be seen by the contestant and not everyone else. I'd much rather read peoples comments or justifications for scores AFTER the contest is over or in private while the contest is going. Just my 2 cents.
Fortune Favors The Brave