For whatever reason, they put the link for those graphs right below the smart pie, and didn't have those links available when they weren't selling the smart pie, so my bad in making an assumption that it was referring to the smart pie.
I would assume that the smaller motor is even less efficient than that.
If you want to find out what the current is at, then you need a watt/amp/volt metering device, like the turnigy watt meter, gt power analyzer, cycle analyst, etc.
Once you find that out, you can bump up the current a little from stock if you notice that the motor isn't getting hot. But i doubt that the motor can take much more current overall.
Golden Motor is notorious for poorly documenting / marketing their products, and their Chinese sales "help" is basically useless. You could check the golden motor forums for some more info, maybe someone would know more.