Hello again,
So I’ve talked to Elliot and the reason he’s not using wp_editor is that it’s not compatible with repeater and flexible fields.
However there is a filter you can use to modify the tinyMCE settings in ACF
acf.add_filter('wysiwyg_tinymce_settings', function( mceInit, id ){
// do something to mceInit
// return
return mceInit;
});