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Sounds more like a bad ground lead.
Those ground points are backed by a fairly large, copper, ground plane - they require a lot more heat than the tiny signal pads do.
Also - are you seeing anything in your terminal application?
Jump Rx - Tx and see if you can see what you are sending on the terminal (no need to disconnect from the Kindle, it will survive).
Check the docs on how the CTS & RTS is used -
The chip might not work without those signals.
And/Or jumper CTS & RTS and set your terminal application to use hardware flow control.
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