Steve,
I never installed the Twinsync. After replacing the carbs with genuine Walbro ones the DLE's ran great and they synchronized very well. They are within 200 rpm's from idle to full power. Like I said in the OP it's all about the basics with the setup geometry.
After getting all the systems working and organized this model is almost as complicated as my Boomerang Sprint. So I didn't want to add another layer of complexity with the Twinsync. Read the manual for it lol.
I most likely will sell the one I have as it's NIB never installed. Take care,
Pete