(Theme: MyStile) Thumbnail sizing

Ok, not sure if this is the right place to be asking about this particular theme given that it’s made by a commercial company, but it is a free theme which I’m using with a free eCommerce plugin so I’m hoping it’ll be ok. Plus WooTheme’s support forum is for paying customers only, not the likes of me so I’m stumped for options really.

First problem is with thumbnail sizing, I’ve set the size in both WooCommerce and the theme options to 400 width and I’ve regenerating the thumbnails accordingly. However when I insert a short code to show the featured products they’re refusing to budge from being 217px wide which over the course of hours has left me tearing my hair out. I assume there’s something in the CSS I can change to fix this but I’ve tried adding custom code to no avail. Any solutions would be greeted with gibbering appreciation.

Second issue is a lesser one, or would be if I could get the sizing right, but I need to centre the featured products/thumbnails, as it is they’re aligning left despite all the setting saying centre. Possibly the only reason that one hasn’t driven me mad as well is because I haven’t spent so long trying to fix it yet.

The site is http://www.maythethoughtsbewithyou.com/shop/ and if any more details would be useful then just say the word.

Failing all else if anyone knows a Woocommerce compatible theme which isn’t so dead set on annoying me and which is suitably minimal let me know.

Thanks in advance…