drz, Sorry I missed this post entirely. I'm no expert on the 450s but have had some experience with them.
I would check into the setting on the CDI box. Seems to me I remember those things having a "dual map" arrangement similar to the newer 2Ts. In one mode the rev limiter cuts in much earlier and power is mellower. This may be your issue with the "jerking".
Did checking the EFI trim help any?
If you do search around here, you'll also find a little "fix" for the self retracting stand that might also help, even though you've already adjusted the angle with the torch.
Seems like you got most of the other items sorted?
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