Are you using a Cyber Commander? If not, then you should not use the RJ11 connection. If so, then you will need to continue using the RJ11 connection to maintain remote power control.
If you are using the CC, then it does sound like the settings in the CyberCommander were reducing the light output. If the CC set that light at full, it sould be the same power as without the RJ11 or dummy plug installed. You may also need to check that the power slider on the Bee was set to full. If you are not using the CC, then power control slider will be overridden by the settings currently in the CSR. This could be a higher or lower setting.
There is no optimum frequency. Should there be interference, it is as likely on one frequency as any other. If changing frequencies (by 3-4 steps, at least) does not resolve the problem, there may be something afoot that is not frequency related.
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