Solution found (probably)
For anyone else that may have this issue, I finally seem to have the problem solved. I'm at least picking up the ambos with the correct ids showing, at this time of night not much else happening.
Solution: Use WIN96 not Arc 96, at least for NSW GRN..... Even though arch96 has a slightly more userfriendly interface for actual programming purposes (filldown, serial fill etc), it has bugger all in the way of tool tips and the help file is next to useless. As well as not being able to program the 16384 offset.
Win96 however, has the tool tips and in depth, useful manual / help file, that actually explains what setting do. Just takes slightly more time to program, but at least it works.