Let's see the bullaun stones please. If you can supply images and immediate landscape contexts I should be able to tell you if they're bullauns or just big cup marks. We get both in Ireland.
These are big cup marks:
http://www.megalithomania.com/show_site.php?site_id=399
This could be either (but is classed as a bullaun - I ain't so sure):
http://www.megalithomania.com/show_site.php?site_id=465
And this is definitely a bullaun stone!