I have noticed that not just I, but a few others had a problem where their Logitech G930 would be louder in their right ear rather than the left. I just fixed the problem with this a few moments ago, I am now just joyfully filled with glee due to the clarity and balanced audio.
My Solution
Control Panel
Hardware and Sound
Sound
Playback Tab
Right click the G930 and left click configure
Click next
Uncheck Side and Rear Pair
Click Next
Make sure that Front left and right is only checked
Click next
click finish
Right click G930 and left click properties
Enhancements tab
Check Channel Pantomiming
If it is already checked, uncheck and recheck it, then click apply.