A couple of things here....
Google provides a "heat map" which will actually give you advice where they think the best place in a forum for ads are - yours are not in the places they suggest. We put our ad in a corner once - it was freakin' siberia for google and we fixed it right away.
We've done the VBSEO and that has helped some.
As for alexa - they suck. They don't track forums very well that I've seen. We've embedded software from quantcast.com in our forum - much more accurate which is nice - I direct advertisers there so they can get a true description of what's going on at our site.
But location location location, and your ads are in the wrong spot. Just my .02c!
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