Just to share with anyone else that may be having this "issue" (I use the term issue loosely).
I almost ALWAYS keep my in call volume at the lowest setting (much like sho, i find it loud in general), and I can't recall exactly when it happened, but for a while it has been almost unbearably loud to the point of hurting my ears at the lowest setting (I couldn't turn it down any more no matter how hard I tried

). So loud that others could easily hear both sides of my conversation without the external speaker on.
I did some thorough searching on Google and XDA and found others that have had this issue on other ROMs that really didn't point to a fix for my issue. However, I could not find anyone on this thread that had a similar issue. I began trying things out, since I KNEW it had to be something wonky with my phone, or others would have mentioned it somewhere and I would have found it (I'm proud of my searching skills

...)...
Well, I discovered the "issue" by calling my voicemail to step through the various in call volumes. The first step louder decreased the in call volume tremendously....

I'm such a dork, I have been trying to turn it down for so long that I didn't even think to turn it up to resolve the "issue".
So, if you experience extremely loud in-call volumes you may want to try turning the volume up during one of your calls, and then turn it back down. I'm not saying it will work in all scenarios, but this worked for me.
I hope this helps someone suffering with the same loud in call volume I had.