Short answer: On more refined ficus I don't cut back for ramification unless there are already new buds ready to go. I'm also in Sydney and I'm not cutting back now because although the current buds are showing growth, when I've cut back in the past, new buds don't push until spring (they may appear but they don't grow). So I feel it's better for the general health of the tree to wait until mid-October in Sydney when you can feel the weather starting to warm.
Long answer:
I have a ficus that I've been trying to build up a lot of ramification but keep it super compact, I've been working it hard for the past 2 years. If your goal is ramification, what is going to drive that is new buds.
If you cut back on a thick branch on a healthy ficus you are going to get a whole bunch of new buds. But the smaller and more ramified the branch the less buds. In the past I've been less patient and have had the tree give up on thinner ends where there were no buds available. The end just shrivelled up. So, now I don't cut off tips unless there are at least 2 new buds ready to go.
IMG_4765.jpg
Arrows showing new buds available before cutting back.
Another thing to consider is general health. Some say continually cutting back growth tips will weaken the tree, but even with a fat healthy ficus, regular/repeated full defoliation, or chopping all of the growth tips off to chase high levels of ramification will slow down growth.
With the goal of building high levels of ramification, you want your tree to be really vigorous because we want the tree to keep giving us new buds. The tree mentioned before has been a lot of learning and some battles. One of those battles is developing a nice surface level root spread. There was a point in the past where I pushed it too far and it just halted above and below.
One unanswered question I have is the value of a full defoliation on really refined ficus? I've seen it before and maybe someone on here like @qitianlong might have a better idea. I've seen plenty of posts where it's been done on a ficus, but I'm not sure if this is done at the beginning of spring when the tree is really pushing new buds. At this current stage where I have a partially refined tree but different branches are at different stages I'm a bit reluctant to do an all over, but it's something I think may be worthwhile when everything catches up and is balanced across the whole tree.
Personally, if I already have primary and most secondary branches in place, I think the best approach is to keep a PJF healthy and work with the tree as it puts out new buds to build more ramification. More patience can lead to tighter, smaller internodes with dense growth at the tips. PJF can put out really tiny leaves (stable in size and below 2cm) if you work it right.