No Mercy, without arguing the issue, after reading his post again I would have to say that he probably has clearance issues. And he may have even had them from the onset using feathers. Most of us on here know that feathers are far more forgiving with fletching contact than are vanes. And most of us also know that out of a properly tuned bow bare shafts, vanes, feathers or whatever should all hit very close to same POI. But we don't know what experience this person has.
As for the powder test. I don't like putting powder on my riser. Instead I borrow my one of my wife's brightest lipsticks and coat the edge of the vanes. At the shot the lipstick will mark where it makes contact (rest or riser) and the vane will usually be wiped clean.