Skinny Dog,
I have to go with your comments, we can have a similar "Bump" out of Sydney 34R leveling at 5000' with crossing inbound traffic at 6000' and 34 departures from Melbourne with 27 arrivals when they sometimes meet at BAKER. Simple solution is to reduce the RoD/RoC as you see the traffic on the TCAS and you can avoid the RA.
Did the Vigin crew get a TA prior to the RA and did they take any preventative action? Or do they just wait until they get close enough for the RA so they don't disturb the VNAV path?
Who is flying the aircraft?