Initialize TinyMCE editor / visual editor after AJAX insert

Did you manage to get the editor working without your javascript included? If so try to create a template what includes a working tinymce editor and then rewrite your javascript to copy that template using the WithDataAndEvents argument of the jQuery clone() function set to true.

For example:

$('.cloner').click(function(){
  $('.container').append($('.template').clone(true).removeClass('hidden'));
});