The Kunena team has announce the arrival of Kunena 7.0.4 [K 7.0.4] in stable which is now available for download as a native Joomla extension for J! 5.4.x/6.0.x. This version addresses most of the issues that were discovered in K 6.2 / K 6.3 / K 6.4 and issues discovered during the last development stages of K 7.0
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I have exactly the same gap problem with Kunena and Beez template. This is the only reference to this problem I have been able to find over the internet. Now I know I'm not alone! I'm desperate with this. I have tried many things but I haven't been able to solve it completely.
Your method seams to work with IE 8 and Firefox 3.6 but as a side effect it doesn't show the forum at all in older versions of these browsers such as IE 7 that is still widely spread. I don't have access right now to a computer with IE 7 to see if it happens the same with your web page. Any one does?
I'm trying to combine your method with MS conditional comments so that these lines of code are only visible to IE8 and are omitted by all other browsers. In this way the web page will be seen correctly in IE8 and at least it will be seen in other browsers but with the gap.