After reviewing your order history, I see you purchased the 4800 refill carts and ConeColor 8oz bottles in July 2012. Based on your explanation, it does sound like one or all of the chips on your # 6, 7 and/or 8 carts are not working properly. If your printer correctly reads the Epson chips, then you can transfer the chips from your Epson carts to the refill carts, and reset the Epson chips to read full again. I included information below to be able to do this.
Attach Epson chips to refill cartridges:
Looking at the chip on the Epson cartridge, you will notice there are two small plastic points that hold the chip in place. Make a note as to which way the chip fits onto the cartridge so you can attach it to the refill cartridge in the same direction. Using a straight razor blade at an angle carefully cut the top of these two points off, which will release the chip so you can carefully pry it off the cartridge using the edge of the blade. You can also use a sharp knife or something similar to pry the chip off the refill cartridge. You will notice the same two points on the refill cartridge where the chip goes (pry the chip off the refill cartridge before attaching the Epson chip in it’s place)- gently line up the Epson chip with these points and attach it to the refill cartridge by using an adhesive such as double sided tape. Making sure your hands are nice and clean, press the chip to make sure it is tightly seated and flat on the cartridge. Now, using the chip resetter- reset the chip and insert the cartridge into your printer.
Please let me know if you have questions, your results, or if there's anything else I can help you with.
Best regards~ Dana