Huge theme. Need to adjust collection graphics on mobile view

[matt0929]

Customizing huge theme not yet published. Created pages for different product collections as each collection has sub collections. Having trouble determining which section to use. Goal is to have a graphic that indicates the collection that links to the correct page. Currently using vendor list section and that works fine on desktop with 5 graphics per section, but on mobile it only shows one and the other graphics in the section intermittently scroll after a few seconds.  I would like to have 2 graphics per row on mobile view. I've tried all the options with only the vendor list section being a viable option. 

Suggestions to accomplish?

Website:

pfstamps.com