zimm0r on "[Plugin: WooCommerce - excelling eCommerce] Change layout small screen friendly breakpoint from 768px to 760px"

In case you're still looking (I found your post when I was looking to do the same thing), there's a filter for that:

add_filter('woocommerce_style_smallscreen_breakpoint','woo_custom_breakpoint');

function woo_custom_breakpoint($px) {
  $px = '760px';
  return $px;
}

The code above in your theme's functions.php file will change the breakpoint printed out by woocommerce.