Hello,
2) You can choose product layout for every single product http://prntscr.com/izrg2p (CMB2 plugin is required)
3) No, it’s ok. It’s a good plugin and we have a demo with this plugin https://www.8theme.com/demo/xstore/jewellery/product/dolce-giavonna-silver-gemstone/ and don’t have this issue. So, just provide me access and we’ll help you.
Regards