Sorry I am not going to be able to help as I have had to put my car into storage until next month, keeping an eye on your exploits though.

Have read somewhere that a 2 ohm resistor was used so think a variable one between 2 and 3.5 would be worth a go

I was going to throw my old seats out and had them cut up and in the back of the car, will try to get at the air bags first so don't go buying any as I can always drop them in to you.