well good luck ! I think you're on the right track with the tattooers you've listed - my vote (which doesn't count!) is for Gerhard or Iain. You will never look at your butt the same way after it's tattooed !
...i think i posted this somewhere else...about when I was healing my backside and my wife walked in on me cannonballin', spreading ointment on my bare ass. Like WTF, right? She could not unsee that, it was weird for her, and I'm all like 'what? we're married!" Once you black the crack, you cannot go back !
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I met this dude (I bet someone here will know T-Po) in Toronto, 2007...he had this AMAZING portrait of BILL COSBY on his ass cheek. Like an incredible tattoo. He also had this super-shitty Edmonton Oilers tattoo, which was also amazing because he was from Ontario. Really good dude, friend of friends, helped out a lot of bands.