1), 5) We have added z-index for the categories row to fix the issue
2) Check now, please.
3) You forgot to add units http://prntscr.com/ulxvs3
4) Bundled plugins do not come with the individual license https://help.market.envato.com/hc/en-us/articles/213762463-Bundled-Plugins . If you want to get access to premium features of the Revolution slider you need to buy the personal license, it’s not our requirement, it’s plugin author requirements
6) Unfortunately, we don’t have recommendations about this because we can help only with theme settings, individual site optimization is outside the scope of our support.
