Just called Kangke...
And they told me that their .91 was cast in thier 1.20 case and they also told me that their case was a little on the heavy side. In fact they thought that the Saito 1.2 would be about the same weight as their .91 if not LIGHTER..... I do know that this .91 fx that I just took out of the box is at least a pound lighter than the TSI .91 and it would be a bear to get to balance.
I know I know and I wouldn't believe it myself if James hadn't just told me this. I can't say enough good things about those guys at kangke..... super nice and helpful.