Fyi, apart from what Owen noted on your map, if you just follow the Illawarra highway to sheep wash road, then don't bother with a recon. I'm on all of those roads all the time and wouldn't have a worry with any lowered cars on it.
nasho has a few bumps, but nothing catastrophic like it used to. Its actually quite smooth through there ib contrast to days gone by. Be aware though, there will be plenty of people using those roads during the day at lower than the speed limit, including push bike riders