Hi, HollyW00d.
Unfortunately the column shortcodes are not going to work inside the tabs and toggles shortcodes because of the inbuilt padding that is applied to those elements. Instead you will need to do make the columns using HTML. Something like this:
[tabs]
[tab title="Tab 1"]
<div style="width: 22%; margin-right: 4%; float: left;">
<p>Column 1</p>
</div>
<div style="width: 22%; margin-right: 4%; float: left;">
<p>Column 2</p>
</div>
<div style="width: 22%; margin-right: 4%; float: left;">
<p>Column 3</p>
</div>
<div style="width: 22%; float: left;">
<p>Column 4</p>
</div>
[clear]
[/tab]
[tab title="Tab 2"]
<div style="width: 22%; margin-right: 4%; float: left;">
<p>Column 1</p>
</div>
<div style="width: 22%; margin-right: 4%; float: left;">
<p>Column 2</p>
</div>
<div style="width: 22%; margin-right: 4%; float: left;">
<p>Column 3</p>
</div>
<div style="width: 22%; float: left;">
<p>Column 4</p>
</div>
[clear]
[/tab]
[/tabs]