With two weeks to go the proper good hidden spots are either going to be shit or shut. I haven't been up the hill for the last week, so can't say for sure what's still decent - anything with trees (90% of my spots) will be heavy and too slow, and the rest are too hard to explain. For spots that will offer you the best skiing as it warms up, either guthega, as it's west facing and will soften slower than everywhere else, or Eyre, just because it has less people and will have less slush buildup, other than that just finding the good spots on the day.
If you're relatively familiar with perisher I can try and elaborate on the other spots