We have been observing behavior in which we have used same antenna, same environment and all things are same.
When we increase payload size to 51, we start seeing CRC error and packet drop, if we reduce packet size to 27 we are not facing any issue with CRC error and packet drop.
No changes in any environment on gateway as well as node side.
Also RSSI and SNR on packet received on gateway side shows better values.
What changes we need to make in configuration to achieve better range with payload size of 51.