A while back, I believe we did receive a few 7800/9800 refillable cartridges that have 7880/9880 chips attached, which may be the reason your printer wasn't accepting the LLK carts if they had the wrong chips attached. You can certainly use an Epson LLK chip on the carts, but I will have two replacement LLK 7800/9800 chips sent to you.
The resetter can give a solid red light if the pins aren't properly aligned with the chip contacts.
By "rubber plug", are you referring to the cartridge fill hole plug or black o-ring? The ACC-OBAG-KIT should have included 8 funnels, 8 syringes, 8 priming tips, 9 o-rings, and a pair of gloves. Are you saying only one priming tip was included?
Please let me know, thanks~ Dana