The feet - I've got 4 on, equally spaced so hopefully that will be ok. But worst case I will try without (just makes it harder to put down). I guess I can find something similar to replace them with.
I have got a good drop time, and regarding the centre of gravity - that is just based on making the fine-tuning adjustments , yes? If so, I have done that. I seem to have it balanced but it's wobbling still.
I think the problem may be the weight at the top isn't enough. It's a GH5 and only tried it so far with the 12-35mm lens (I have some larger heavier lenses but not tried them yet).
Am I right in thinking if the weight at the top isn't enough - even with a good drop time - that could cause a wobble? I've literally not had chance to try more weight since thinking about this but hope to try later either with a bigger lens, or putting some weights on the top etc.