Did you check the voltage across the reset terminals of the chip?
Also, if you go to the Compass Micro website and look up your R3000, you'll notice a note at the bottom of the page referring to the "ink cartridge sensor connectors". Not that yours are damaged, but perhaps if there's less "spring" in the contact terminals, and your cartridge is not an exact fit as OEM (a fraction of an inch shorter perhaps?), it may not make contact. I think I've heard of people placing shims to make the cartridge sit tighter against the sensor connectors. This is just a guess.
I'd check the voltage across the reset terminals first, though. If it's not the same as the battery, I'd polish the battery contacts again.