Mr. Bradbury,
You seem to suggest that hat the basic clip does NOT provide full 6DOF. Au contraire, but it does. That's the reason for the three reflectors, just as the Pro clip has three LEDs. They both do *exactly* the same thing, functionally, differing only in small details.
For both devices, the three points permit sensing position in 3D space. From that derives 6DOF.
I might have given the false impressed that I spent numerous hours in settling on my profile. I had the rudiments down in the first half-hour, with perhaps another 3/4 hour of finessing.
Where I *did* require no small amount of time was unlearning my former single-point solution to pseudo5DOF (note that I eschew roll, simply because it's the one head action that we already do and need not augment--it's unnecessary.) Where previously L-R translation was tied to panning, up-down translation was tied to pitch, and fore-aft translation was tied also to pitch, these fully automatic actions did not require me to do much more than swively head. Now I *have* to laterally translate myself, sometimes going against panning. But I've pretty much got it down, and am liking the control!
I'll add again my delight in having the clip mounted farther forward than a ball cap permits, using a piece of stiff hanger wire to attach it to my headphones headband. This means that when I pan, my in-game viewpoint translates in the *same* direction, just as occurs in reality. Try swivelling your head while seated without your eyes translating also; you really have to work against this happening very naturally. An additional advantage... I can't forgetfully wander about the house wearing my clip.