Im not sure about your math, but your approach seems sound to me.
There is some loss in all cabling and connectors so your best bet is to experiment.
You can also detune by simply using a less efficient antenna.
No, you won't hurt your transmitter. The point is that all RF is just energy and it either radiates out your antenna as RF or is absorbed and turned into heat by the wires and in your case, the added resistors.
The key about being compliant is to never ever step on a commercial signal.
It is nice to see someone that is concerned about their signal strength. Good for you.
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