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I agree with Jackson. Re-torque your head. It won't hurt a thing to do so. You can not torque your head too many times... you can only torque it too much. Keep it at 55 lbs.

Even if your head does happen to be leaking your radiator cap should seal tight enough not to allow water to escape. It should only go out the overflow tube. At a minimum you've got a radiator cap gasket seal issue. Perhaps cutting an additional gasket out of a thinner material to supplement the gasket already in place. There are different thicknesses of cork gasket material available at most auto parts stores.