[mr.pure]

Mine are pretty spot on and I have a pair of 9.5's.
Not as tight as some but right on, so if you find that most 9.5's are a good fit you could probably do the half size drop although I don't tie my laces, so too big and I get blisters unless I "lock" the top lace (thanks again mr.p ) so with tied laces maybe the half up would be better. I'm weary about doing it but I can rock a half up or down but have found some 9.5's tighter and some looser so was thankfull not to have had to gone up or down and have only done it once either way.
I hope this is helpfull and not just rambling like it appears to me when I read it back.

What's your name ?
Donald rumsfeld !
"As we know,
There are known knowns.
There are things we know we know.
We also know
There are known unknowns.
That is to say
We know there are some things
We do not know.
But there are also unknown unknowns,
The ones we don't know
We don't know."