Looks like the clutch is part of your problem. Either it has warped steels, or you have the stock clutch cam still in it. I would reccommend a clutch mod (one piece mod to the stock multi piece component or aftermarket internal hub component) and also possibly a Brock's cutch cushion.
They should allow you to be smoother with the clutch preventing the "chatter". Also, stay conscience of the 330 time as well. a good 60 with the wheel coming up at the top of first is no good either.
John