The logic for acknowledgments and retransmissions implemented in the Wireless Serial App assumes there are only two Wixels on the channel, so I am not sure why it is working for you with 3 Wixels.
In case it helps you find a solution, you might try looking at Wixel apps other users have created; we have a list in this forum post. Specifically the “radio_multi” and “wireless_serial_channel” apps (both by Geoff) would probably be good to look at.
- Patrick