Hi not sure whether you solved this, but I have just updated a website to include a WA Pro map on a responsive website
All I did was to change style from pixels to a percentage
from: <div id="wagmp_map" style="width: 600px; height: 375px;"></div>
to: <div id="wagmp_map" style="width: 100%; height: 375px;"></div>
the map is placed in a responsive row, set to fixed width rather then fluid width
eg http://www.plattsvancentre.com/find-platts-stoke.php
the page has got 4 responsive break point and the map fits the width perfectly in all.
The depth is fixed, however the 375 pixel height works well on tablets and phones
hope this helps
Thanks
nathan