LOL cable lifters! One of the silliest things in high end audio. Right up there with resonance dots, tibetan singing bowls and other nonsense. Any cable company selling those I wouldn't buy anything from; not a fan of the silly cable companies like Audioquest, Nordost, Kimber, etc either.
A headphone amp for $900 sounds very expensive, can't imagine what makes it worth that much. Get a pretty nice powerful two ch amp for speakers for that much...but I'm not a headphone guy, let alone the cost of your headphones (just looked it up). Don't like speakers clamped to my head.
You have spikes on your speakers to grip the carpet? That's what they're for.
More interested in the non-headphone part of your setup....