Let's discuss and see what's happening here. How do the rubber spirals on the auger look? Have they worn down?
I'm posting this as an answer, but it may NOT be the FINAL answer. This is just the first step in troubleshooting, so please hold off on accepting until we pinpoint the problem.
It shouldn't touch, but it should be close enough to move the snow. The two flat ones in the middle would be the one's most likely to toss the snow forward.
I've located a manual for your unit that might be of help to you to make sure it's not a slippage problem before you replace the spirals. The adjustment procedure is on page 8.