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@Kidneys
If you're trying to fill a 'gap' with ptfe, forget it. It isn't designed for that. It will help the threads engage so that you can crank them all the way home safely and positively, but it won't stop any play under load (if you get any) as it will become compressed. It's not steel, after all.
To be honest I think you're probably fine as you are. If your lockring is tight, then it's going nowhere.
Try a different cup if you're able to. Or go sealed and never think about it again.