I heard directly from Artech that the Phantom was too heavy. The consensus seems to be that the synergistic "fit" is the SME V; but I never went there when I had mine.
I believe the Phantom is a bit heavy for the Orbe. As I recall, arm plus armboard shouldn't exceed 1 kg for proper spring function. The Phantom is that by itself. FWIW, I ran a 2.2 with and Orbe SE for years and thought it a really nice match.
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