I think everyone has to figure that out for themselves, how long will they continue as is or go for surgery..
Extra cervie ribs do have better outcomes- with a
very good surgeon in most cases.
Scar tissue can be a factor, pre op and post op- you might be developing it as it is right .. those ribs rubbing around crowding things..

a good question for the doc...
You're lucky your voice has not suffered, mine cracks all the time since my RSI/TOS started (03) and I love to sing along with the radio..
How long have you been having issues due to this?