Despite all prerequisites having been met, the perk "Air Control" is grayed out and unable to be unlocked. Attached is a screenshot showcasing said bug in action.
UPDATE - It seems that gaining additional XP for the headpiece results in "Air Control" unlocking. It's not unlocking at the correct XP amounts, however, so an issue still exists.
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I'm having the same problem, but it doesn't seem like the perk underneath is going past halfway :-/