If there is no way to assign probability, you can´t rule it out, can you? That´s my point and that´s why I´m a 6.
7 for me means, there is no way to ever change your mind, no matter what evidence will ever be shown, and that is not skeptical.
If you define the 7 different (including the possibility that you err, like Hokulele did), I´d join that camp in an instant.
So, maybe the definitions of 6 and 7 are really the problem. Maybe we should clear that up.
Is the "knowledge" in 7 for you provisional knowledge that could be changed or is it ultimate knowledge that can´t ever be changed?