Whilst waiting for the stock Sony ones, I've tried a range of tips but to no avail really. On my ears - which I think are average sized - Symbio W ones are good for sound but poor in terms of comfort. I'm looking forward to trying out the Sony ones when I get them but not holding my breath that they'll be the answer for me.
My Andro custom tips are pretty much perfect, but given the heft of the Z1R I wouldn't expect customs for those to be as good which is why I have been curious to know your thoughts on them. But going by your experience, at the very least it seems a vast improvement can be had, which gets my hopes up as the sound is sublime with the WM1Z