Collection List Display - California theme

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I am using the California theme and and trying to display the collections list 5 across (for the desktop). They will form a nice visual navigation for my product catagories on my homepage and at the moment you can only do up 3 across and nine in total, which means i get an annoying gap between every nine images. Ideally I would have all 26 categories laid out 5 across in one block, i will attach my unpublished site link for reference.

There is also the issue of my images being cropped slightly. It's really confusing because they look perfect in the editor then crop on the preview.

Is this possible? I imagine it will require some coding which I have very little experience in. 

Please help!