RE: RCEXL Opto Kill and Airtronics 92824 receiver issue
Have you checked AUX7 or AUX8 on your 8ch Rx?
The gear channel (ch5) is set to +/-125 EPA (basic setting). unplug the kill switch, set both EPA values (gear ch5) to +/-100 and re-plug the kill switch.
The RX500, RX600 and RX700 have got a similar PCB. Thus, the RX700 should works like the RX500. I just check the RX600 and this setup works fine on +/-100.