You could always tuck the wires under the baseboard without removing them. First you might try actually drilling the fireblock to make sure it is actually there. I've never seen them in residential construction here. And I would trust those stud finders about as far as I could throw one.
Re: I wouild like suggestions on Tires
IMO I like the metz. Personally haven't used the shinko. The metz will definately last a long time. I think looks better and is a little wider. And I don't like the name shinko, just sounds like a cheap crap tire to me. Kinda reminds me of the cheng...