Hello, CTan1029
Welcome to the Microsoft Community.
Thank you very much for your feedback. I have carefully read the information and problem description you provided. You mentioned that the right earphone of your headphones is louder than the left earphone.
I understand that this problem is frustrating for you, and I noticed that you have tried many methods, but the problem still persists, which is indeed frustrating.
Don't worry, I am here to help you. It seems that you have tried most of the methods, and your problem may indeed be related to software configuration or hardware failure, so I want to provide some other methods that I can think of that may help you.
Method 1. Although you have tried to restore and update the driver, you can try to completely uninstall and reinstall the audio driver by following the steps below to ensure that any corrupt or misconfigured drivers are removed.
Open Device Manager (Win + X, select Device Manager).
Expand Sound, video and game controllers.
Right-click your audio device and select Uninstall.
Check Delete the driver software for this device, and then click Uninstall.
After uninstalling the driver, restart the computer and Windows will try to reinstall the driver automatically.
If the audio driver is not installed automatically, visit your computer manufacturer or sound card manufacturer's official website to download and install the latest audio driver.
Method 2. Disable sound effects and enhancements. Some sound effects and enhancements may cause sound problems.
Right-click the volume icon in the lower right corner of the taskbar and select Sound.
Select the headphone device you are using, right-click it, and select Properties.
In the Enhancements tab, check Disable all enhancements.
In the Advanced tab, uncheck Allow applications to control exclusive mode for this device.
Method 3. Confirm software problems
Sometimes specific software may cause volume problems. Try playing sounds in different applications to check if the problem persists.
At the same time, I suggest you check if there is any software related to audio adjustment installed on your computer. If so, please temporarily uninstall these software.
If the above methods do not work, there may be a problem with the audio hardware.
If possible, I suggest you try to use a USB external sound card to test and see if the problem persists.
Best regards
Brian - Microsoft Community Support Specialist