I'm not sure how this thread got derailed to talk about the clutch helper spring, but the OP was asking about jerkiness from 1 to 2, which is unrelated to the helper spring issue (which to me, is all about better clutch feel in 1st when starting from a stop).
The jerkiness from 1-2 is because he's probably trying to shift fast at lower RPM. In order not to be jerky, you need to shift slower from 1-2 when your RPM are low ( <3K or so). Above 4K and you can shift as fast as you want with no jerkiness. Basically, drive slow -> shift slow, drive fast -> shift fast.
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2009 Nissan 370Z Touring, w/sport, 6MT, chicane yellow/black.
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