I don't think soldering the wire back together will help with your output or clarity. From my research, I would say the cut wire opens up the 10 meter band which includes the "free band" in the 28 mhz range. The "free band" is not really free, it is a no-no to broadcast on it until the FCC approves it for use. The cut wire will also give you access to the ham band. Don't talk on that without a license.

As for clarity and power, don't over modulate your voice and you should be able to be heard just fine. I'm sure the tech increased your power output from 2.5 watts to 5 watts.

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