Hello,

1. Please add this code to the Theme Settings > Custom CSS > Global:

@media (max-width: 768px) {
	.wd-spacing-30, .wd-spacing-20 {
		margin-right: -15px;
    margin-left: -15px;
	}
}

As for the rest two question, we are sorry, however, there is no options or possibility to do that.

Best Regards