Hi!
In case you are using the isotopic layout, I would suggest to try 50% width for the items.
Try to force it with this CSS code:
[code].rpp_item {
width: 50% !important;
}[/code]
I’ve tried this, and it looks like it works, at least on my test environment.
Full width window size: http://i.imgur.com/j6Owfph.png
Smaller window size: http://i.imgur.com/GItN4ie.png
I’m not sure how this would work on more elements, it might not.
Since there is a margin and padding as well on the box, the items may appear as non full width, but I figured out an elegant way to make the container appear without padding like this: http://i.imgur.com/8gMvOMT.png
Go to the Theme Options -> Container Layout panel. Then set a negative margin on the left and right of the box. In my case it was -10px, but you might have to experiment. Also, set 0px for the left and right padding of the box. Here is how I have it: http://i.imgur.com/2Gb72V7.png
That should stretch the container to width where the items appear to occupy the whole width of the post.