Both RC ignition and CH electronics make conversions for the G38......I beleive RC Ign do the conversion and I have used the CH bolt on set up successfully.......
Whether its worth it to you is a personal decision...It wont add much to the top end,it will smooth out the midrange some,and it will improve the idle and hand starting (no backfire) quite a bit.....some significant weight savings too ,Im not sure exactly how much on the G 38,but its about 10oz on a Quadra 400 or Ryobi .
I have never heard of any magic aftermarket balancing procedure for the G38 or any other two stroke single for that matter.....