1) Here you can find demo settings for the XStore theme https://dropmefiles.com/bj8uy
Just remove CDN settings and update them according to your needs if you use CDN.
2) We did not try XStore with Litespeed cache on our demos. But many of our users use XStore with the Litespeed with no problem. Our theme supports modification and combine CSS/JS, so we don’t have any special recommendations for the cache plugin settings. You can enable these options.