Hi there,
I also would like all the images to stay full height if possible, they seem to change depending on how much text is in the column beside.
That’s how background works 🙂 , it will respond to container size, and container size will respond according to its content. If you wish to maintain full-height while elements and content respond then you might try the rev.slider instead of standard section. You can have the slider for each column or block. 
About the map, please add your google map API as well. I checked and it’s not added.
Thanks!