These cartridges (nor any Epson cartridges made by epson or anyone else) do not have ink level sensors that measure ink amount. Refilling a cartridge does not reset the chip. On the R3000, waiting until the chip resets itself (and pauses the printer) and then taking the chip out and putting it back in is the reset procedure (as explained in the instructions).
Re: 7880, this seems a problem with your resetter. I suggest taking the chips off your old carts and put them on the new carts (or use your old carts). I’m letting Wells know to send you a replacement resetter.
Even better, if you have a set of OEM carts around, use them Epson chips. I’ve done this in the past with this printer to great effect.