On my devices the vendor id is the same, so the plugdev file should be universal.
Did you have success on frequencies above 850 MHz?
I noticed you put a voltage section in the configuration, that sets some voltage on gpio5
Is this documented somewhere else ? I looked in the datasheet but couldn't find anything there, neither in the gridseed cgminer version on github.
Where did you find this additional information ?
For now it's running stable on my pi @850MHz for 3 hours and my pi is clocked at default frequency.