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I am not sure which theme you used as a model for the one you are creating but I had a similar problem using the PHPKOAX theme. Everytime I removed the blocks from the left for a module I still had a gray background left panel and couldn't get the module content to position full page center like I wanted it to.
The fix:
The theme was missing the showblocks code for the leftblocks.
Just after be sure you have this code.
<{if $xoops_showlblock == 1}>
then make sure you close the after the left blocks table cell.
<{/if}>
This worked for me and everything functioned great afterwards. Hope this helps you out.
Quest