I have .9% off now and for last 1 year atleast on loans about the same but grown since the discount but not through broker.
CBA has become bit difficult to deal with though in last few months but i can and will switch if a better deal come from another bank.
I have directed the above comment to my broker who in turn is directing it to CBA. I've got .75% off but am pushing hard to get the same as you, especially as your loans are the same as mine. If the broker can't do anything I'll negotiate by myself.