I use the Carbon plugs by Durratrax (Carbon Speed) and have NO problems with the plugs at all! I have yet to have one go on me in under 1 gallon. I use them in both OS and TRX mills. Give one a go and let me know what you think.
I think you will find the DurraTrax plugs to be good. I dont think Ill be buying anything different anytime soon. I just picked up a gold one by them too. But, Id have to pull a fully functional plug just to test it out. can't KILL THESE THINGS! LOL!