Both those things can cause issues,
The hole needs to be fully drilled to create the proper chamber.
Dill her our completly and reset the ECU again, but BE CAREFULL with the o2 sensors they can easily get f-ed.
Twisting the wires I beleve might be the thing causing our issues, they are VERY delicate, its very important to do every step to prevent from twisting the wires because that could easily damage them.
Get the code checked, most likely its not getting anything or incorect signals from the sensor.
Please go though the whole "How to" before doing it, It explaines how to handle the sensors to avoid damaging them.
IMPORTAND to unclip the o2 sensor first so that you can spin the wires while you unscrew it to insure you dont over twist the wires.
Good Luck, unfortunatly twisting the wires might of ruined the sensors, and they might need to be replaced.
BTW I love the BC2 Kit, and Hope to have her on my ride eventually.