Steps
1.Edit build prop line: "persist.Audio.Fluence.Mode" value from "endfire" to "fluence" and save.
2. Reboot
3. enjoy
In case you were wondering, I did research on the mater seeing as everyone including myself are having issues with ppl hearing us. I stumbled upon as forum for some other lg where a rom was giving the same problem and they found out how to fix it. I believe the build prop line they changed was donating like "ro.Audio.fluence.cq" and they changed the value from "none" to "fluence". Well I took a chance and found our equivalent build prop line containing a fluence mode value and changed it, rebooted, and made a test call to my gf who was the main victim of the mic problem and right away she noticed the difference. Then I called other ppl who were also asking me to speak up and they too said they could finally hear me normally. Give it a shot. It worked for me.