I am currently owning a nissin di866 mark 1 flash with an eos 60d camera. It seems that the flash would always fire at full power no matter what settings i set it on in manual mode. Furthermore, the pictures that i have taken in a pitch black room with the flash at full and lowest power is the same. Both are extremely overexpose. Fruthermore, the ttl mode and auto mode on this flash always underexposes the image very badly and i am using direct flash when taking the pictures. Is this a faulty unit? Should i return it to shashinki and ask for another di866 unit to replace this faulty one? I can still return it for free until this friday.