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best RF reception settings

I have a project where we have 2 nrf51 that need to be time synced with eachother.

The problem is they are placed on the body one on the back and one on the chest of a person.

So the reception is not so good (no line of sight and the human body that shifts the antenne frequency)

For a custom RF setup what are the best parameters to use ?

I already set the TX power to +4dB, the address to 4bytes, crc to 1, i am also using the highest BTLE advertising frequency because of the antenne frequency shift.

And there is less wifi activity in the advertisings channels.

But of these settings I am not sure:

  -  whitening on/off

  - Use 2mB,1mb or 250kb/s

 -  use BLE_1Mbit or NRF_1MBit (BLE 1MBIT uses a bigger RF bandwith)

 -  Use hamming errorcorrection for the 4 payload bytes or do I have too less data to make a difference ?

 -  Should I send  as fast as possible or use some delay so the RF can stabalize ?

 - Any other thing I can do to make the receiver more sensitive ?

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