MTB, I have tried the fiber kind, didn't work. I have not tried the rubber o ring yet. A buddy of mine is trying to locate a piggy-back plug for me. Basically it is a little bit bigger than the stock plug. You put that in with thread sealer, essentially rethreading the pan and leave the plug in. There is another smaller plug inside the big one that you drain the oil through. This will be the last resort before changing pans. Will try the rubber first.
Thx about the avatar, I like yours too.
Also, I know I probably won't have a leak free tuck after this, but I am losing two quarts a week.