Just out of interest, if you are using the default wrapper it shows:
"You can use the .t_inner and .t_outer classes for your wrappers. These are in the actual style settings and will adjust the wrapper look depending on the style they are used in."
Opening HTML
<table width="100%" class="t_outer" cellpadding="0" cellspacing="0">
<tr>
<td>
<table width="100%" class="t_inner" cellpadding="0" cellspacing="1">
Have you tried altering that?