Contact and Social Widgets are aligned left in default

You’re not using the right widget for the social profile. You need to use Moesia FP: Social. That one is aligned and has bigger icons, the other one is for sidebar use.

Also, the contact widget isn’t centered because it’s meant for sidebar use. But you should be able to center the content by adding this in a custom CSS plugin:

.moesia_contact_info_widget {
   text-align: center;
}