I would be interested to hear what the OP has found with their trials.
Our home recently finished construction and we have had a SHW system installed alongside a hydronic heating system. We live in Melbourne as opposed to Perth and the coldness of winter is already starting to set in some evenings/mornings (and its only the start of Autumn!) but I don't fancy boosting my system all the time if I don't need to. I was planning to do some trial and error myself until I came across this post, so there's a few things that I am interested in trying out now.