You're confusing "ownership" of Fed "shares" and ownership of Treasury Bonds. Your confusion is sad, but not surprising.
Btw, by law it's 6%, IIRC.
Yes, 6% of their "shares", not 6% of Fed profits. Not 6% of the debt either.
No, you're just trying to circumvent the truth. The treasury MUST eventually get the money to pay off the bonds from the Fed, by issuing even more bonds/debt. It's a self-perpetuating scheme. The debt can NEVER be paid off.