Hey Adam,
you are satisfied with the PwnCNC v9, really? I would have assumed that like all rear mounts it is not satsifactory and the angle with which the air goes from horizontal to vertical is brutal on the v9.
What hose diameter do you use, and do you use a Workshop Vacuum Cleaner or a Dust collection System?
You know the v9 is available with a longer version to accomodate a drag chain?