That the commercials short interest went up should be no surprise. They have not yet given up and begun covering and until they do so they will continue to sell into the market in an attempt to hold the POG down. It is still possible that they have enough bullets to be successful, but the odds are beginning to be stacked against them.
The selling late today suggests that they increased their short position even more and this will be a daily game until gold completes it breakout. A solid breakout will force some covering, I would think.