Auzzie coilers

Hi, I've just got a few quick questions....
    Are there any/many coilers from Australia on this list (other to me?)
and/or are there any Australian teslathons or stuff like that??


    How can I tell if my coil is over coupled or under coupled?
I'm running a 4.25" coil with a 30 degree primary on 1350VA and am getting
terrible results after tweaking everything from the caps to the ground rods.
could over coupling be a major factor here???