Hello,
1) Unfortunately you can’t update Visual Composer with your current theme version. Because as you mentioned it is built in. But we are planning to release a new theme update and then you’ll be able to update this plugin. It will be implemented in 2.2 version.
2), 3) Add the following code into your custom.css file:
.main-nav .menu > li > a {font-size: your_value px !important; padding: your_value px;}
We have both support centers working. And we have created a new support form to make a conversation with clients more comfortable, as many questions and issues are very familiar and their solutions are visible on the forum.
Also the questions which need further and longer investigation are redirected to the ticket system support.
Regards,
Eva Kemp.