All I have to say at present is this:
Unless you return the "Powered by phpBB 2.0.6" link to its rightful place, you're not really playing fair at all are you ?
I'm not prepared to offer help or suggestions based on that fact.
The bottom of your pages should read:
Powered by phpBB 2.0.6
Boredom Boundary 2.0.6 ©
You're taking credit for a lot of very hard work by the developers of phpBB and the least you could do is leave the link in place.
There's nothing to be ashamed about in using phpBB or Invision, or any similar product, and while phpBB may be open source you only have copyright over your site content. You have no claim on the code that is running it and your link looks very much like you're taking the credit for the web application that is running the site.
If I recognised it for what it was at first glance you can be sure other web users who are familiar with phpBB will also know it as well.
Sorry if that sounds harsh, but when the correct link goes back to where it should be, I'll try and help you out.