How might I group a bunch of text boxes without getting a space around the edge?

[Augusta]

I use Powerpoint to format tables that have been sent in a word doc as a picture. When I ungroup, format and regroup, Powerpoint 2010 now leaves a space/border around the edge that means when the 'picture' is imported back into Word it is no longer aligned with the page margins. It's driving me nuts! Is there a way to fix this? Any advice very gratefully received!