I have 2 different headphones that squeek with my every move. focal elear and fostex trp60. I have tried lithium grease, ptfe spray, wd40, nothing lasts more than a few days....I hate squeeks so much I have those headphones collecting dust. did the talcum powder work? I feel your pain.
Power: Marantz sr7008, NAD C 275Bee x 2, Video: Oppo 103, Samsung 75un6300
Speakers: Focal aria 948, Focal cc900, Klipsch synergy KSF 10.5, Magnepan LRS
Subs: Rythmik FV25HP, Rythmik FV15HP