When I first started using Triple Sr7en I also had some plug freezing problems and found two solutions. One was to pour some cleaner down the bore wait a few minutes and then screw it out the second was I heard Cayugad talk about CVA's slick nipple and bought some. That stuff works great!! I haven't had a seized plug since I started using it.

As far as using the tape I haven't but you don't have to worry about the white tape and heat it is used in gas plumbing as well including stoves and dryers has been for years with no problems.

I thought you may have had a blow by issue.