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Now I'm a little lost here, where is the ptfe tape going on the compression joint? On the threaded part of the joint or elsewhere. I know ptfe as a thread sealer and lubricant, so can be used in bleed nipples on brake calipers if you are using a method to draw the fluid through the caliper, the ptfe seals the thread but also acts a lubricant meaning that bleed valves have less chance of seizing. Hence using a few turns of ptfe tape if reusing an olive, in my case replacing radiator valves, to lubricate the join.
lynx
Teflon tape only works properly on plastic fittings by design, by luck it sometimes gets bodgers out of jail on compression fittings. What you need is a product called lsx, a little dab smeared around any type of joint, no too much, and you will be transformed into a plumbing god. A god with slightly sticky fingers but a god nevertheless.