I said screw it and just installed the patched build bmc let out today. Restoring the phone now. Running ok atm
EDIT: In call high volume appears to be fixed! Yay no more yelling in my ear. Just tried it by making a bank phone call. Time to tinker with new features now. BTW I tried a dirty flash and in call volume was still borked, so I wiped. Now it seems fixed, like I said.