Sounds like you're going the right route to me.
Invisibility trumps distinctive features, IMO. "Face is icky lump of rotten hamburger and has 2' spikes all over body" would normally be "non-concealable", but if he's invisible, no one would notice.
Especially as the force-attunement is a disad ALL force-users have, I'd say it's appropriate as a disad. The Sith have to learn how to conceal it, right? It would be conceivable to have a rookie Sith that could be detected?

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