Sorry to hear there was not more participation. These kits just seemed to have more gremlins than the 660s.
I built one of them with an OEM 044 P+C and it still seemed to have more vibes than is should have. I trimmed the rubber on the handle on the upper right side, it was contacting the top cover there. All of the handles I have seem to be a little different, some contact, some don't. I also noticed there was not much space between the upper left vibration mount and the case. I added a washer between the mount and the case and the saw seems much smoother now. A lot of playing with em, but hopefully they will be good now.
Also, lesson learned … just because I fixed the impulse does not mean the original AM carb is good, so I did some carb swapping today also.