nice one
Orangespace, does seem you've found a plant ally, my advice is to take care of them as you would good friends, if you cultivate a receptivity to the alterations they can gift, even just by sitting with them, then they can also show you their own version of care.
most forms of obtusifolia will have quantitative (amount)/qualitative(different alkaloids) differences at different times of the year, and southerly forms seem to vary from northerly see
here for more.. it's important to not reveal information relating to location on the internet, and to normally use the acacia identification thread for id's. another cool thing in the linked thread is that experiments on obtusifolia were done using twigs and phyllodes
peace