I'm in the national park but haven't ridden in the south. Did my first reconnaisance mission to Keira last weekend. Was impressed by the state of tracks, the bottom half has a number of different options, i didn't suss them all but what i rode was looking good.
Not sure of agreed names for different lines but "two" as it was referred by riding mates (trial head starts with step over boulder) was well settled in, the lip of the big drop off half way down is a bit shaggy with bits of timber sticking out, not impeding ride.
"Three" (trail head at top of hill past end of road to right under small tree) was really good fun, has some loose gravel and could bed in a little more but is nice and steep with great gap jump.
haven't ridden possum's but if anyone's willing to give away details, i'ld appreciate a pm with directions to trail head.