Hi,
This is a really old thread. Since then, you can set the height/width of the thumbnails directly in the options of the listings and thus easily have different sizes for categories and products. No need to have that CSS anymore.
2. There is no read more button. You can just click on the product name or the image.
If you want to add one, you can edit the file "listing_img_desc" of the view "product" via the menu Display->Views and add a read more link easily like that:
<a href="<?php echo $link; ?>">read more</a>
3. That comes from the CSS on your website.
Try to add that CSS to fix that :
.hikashop_product_item_right_part{
margin-top: -49px;
}