I also did an advanced espresso course but at the time the Silvia I played with was really hot and I couldnt even produce one as good as I usually did at home. Now I have a Galatea and like you Id like to take my technique further but as its just a hobby the $ cost is a bit limiting.
Perhaps some Sydney CSers could get together and swap techniques and compare each others techniques. Thats really the least expensive option. (but carting HX machines around is a bit hard.)