[Woothemes: maximize] WooCommerce change product size and columns amount

Hi all!

I’m looking for a way to alter the WooThemes Maximize theme. I like the whole theme, except for a few small points. How can I adjust this?
Link to the shop demo

– The products in the shop are to large. The thumbs are 150x150px 75 would be enough for me. This way more products can fit in a row. Also the rest of the product div should get smaller too.

– I would like to get more products in a row. But most likely this will get solved by making the product smaller in general.

– How can I customize the products in the shop? Say, the theme displays the description. But I won’t need it on the shop page.

— lastly, I guess this all gets overridden when they update the theme, right?