Jetpack Tiled Galleries forcing element.style width

Experiencing a problem with the Jetpack tiled galleries – whenever they’re used, it’s forcing smaller screen sizes (e.g. iPhone) in my responsive theme to not size down appropriately.

After much research, I’ve found that I can’t change the width of the “gallery-row” element because it’s hard coded into the plugin as part of:

plugins > jetpack > modules > tiled-gallery > tiled-gallery.php

… as a “style=” designation in the above PHP file – though I can’t work out how it’s calculated.

The fixed width shows up as an “element.style” of “475” which I can’t override with CSS.

How can I override this? I’ve tried poking around and editing the plugin files, but that’s way over my head and I just made a mess. (I’ve since restored it to the original version and the problem persists).

Thanks
-kevin