Hello,
2) Can’t you find the background image option to upload your image for the row? I checked your page and see that you even did not try to upload bg image and follow my video link https://gyazo.com/deed58430f6e4f7bdc0f6f7febf02339
Please, watch the video tutorial on how to use WPBakery page builder https://youtu.be/MXQKH66M3Wk
Provide me screenshot of the gap that you want to remove.
3) Have you tried to move the whole carousel element (1) http://prntscr.com/s4tbx6 or just one single image(2)? And why don’t you add the bg color for the row with the carousel (3) instead of moving it to another row with bg?
Regards