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I like the direction of the top two and prefer the second one of that set. That font kinda works but some of the letter width is too varried, specially with the H, E, and A. I'm distracted by the spacing (tracking) between the letters, that might help with the varied widths of the letters mentioned above.
The play with the S to make the lock works but the top of the S could be smaller. Play with thickness from thinner from the top and wider towards the bottom. Usually looks tend to have a wider bottom then they do top.
The "Co" is kinda throwing me off. Maybe if the O was little bigger and more toward the center..keep playing with it i like your idea.
