Let me join HS in again heartily thanking the administrator's of this forum.
I'm sure this is a frustrating issue for you, but I don't think you have been heavy-handed at all in your work. After all, this forum seems to be growing rapidly, and if you don't get a handle on this now it will become overwhelming.
However, perhaps it would be helpful to review your FAQ's and Forums Rules & Policies? While some folks really will never learn, many others probably don't understand the structure at first. I know it should be obvious, but perhaps some additional, specific direction in the FAQ's and Rules would help you and your members?
Thanks again for a tremendous resource.