[Rosie] I have found that turning them upside down usually helps. Then again I'm no expert any more than I'm a left handed sort of a bloke. Keep in mind, Rosie, that the heavier boomerangs were not designed to return but to stay in the air long enough to knock the noggins of the target.
(CdM) Not surprised it's snowy up Mount Buller. An assumption, of course, because you have quite unforgivably omitted the ρ-coordinate, which I take to be 6378137 + 1805 m. Greetings, anyway, from 51.32; -0.06, 6378306 m.