Great report chap, as a Southener I know these roads so enjoyed the read. March is generally good down here as you found out.
Sounds like you found all the good roads, possibly missed the Arthurs and Lewis passes but you cant do everything eh.
Was impressed that you rode the route from Ettrick (south of Roxburgh) through to Riversdale. This is one of my regular haunts, there's next to no traffic (or cops) on it apart from the odd cocky on a 4 wheeler or tractor .
And yes, the corners on the Cadrona range are very well engineered indeed But, like the Milford road, it's hard to get a good run at it in summer unless you get up at sparrow fart.
Nice one, glad you enjoyed our back yard.