So I have removed around 450 duplicates using the aforementioned method. Now this booru must be more or less dupe-free, having only the best quality images out of every duplicate group. I have solved the problem of having to search for found duplicates manually on the booru by using the javascript+flash database solution I made myself, which finds thumbnail's location on the booru based on the image hash in it's name
http://puu.sh/c8lDz/3b8c72244e.jpgAlso, now that I'm an admin, let's hope this place will be less dead, your contribution is valuable. I'm going to make this site become THE definitive source of seiyuu photos, I've always wanted this to happen.