Rephrase ... not a jiggle ... ie, not a really fast moving sort ... rather a slightly slower, maybe 2x per second back & forth, coupled w/ a bit o pressure one way or the other. Better?
First, let me say that I am a complainer myself. I am very dissatisfied with this update as it makes Autosteer largely useless for me, especially on long straight highway runs (which is really where you would want Autosteer to shine!).
That said, if you want to prevent or dismiss the nags, there is no need for back-and-forth, and in fact any back-and-forth motion is probably counter productive. The most reliable thing is consistent light pressure in
one direction for around a second, or until the nag disappears. Going back and forth it seems can result in the pressure averaging out to zero, at least in the way that they read it. I'm sure they need to filter the signal over time though some sort of low-pass filter to get rid of noise; therefore any kind of back-and-forth may get averaged out. The faster you go back and forth the most it looks like noise to the system.
Now, back to complaining -- even though I have just explained how to reliably work around the problem, it is still completely ridiculous that this workaround is required, and even more ridiculous that you can more reliably avoid the nags with one hand on the wheel than you can with two hands on the wheel (in, e.g., the recommended 8 and 4 positions).
Fellow complainers, please don't just complain here, but complain to Tesla directly. I haven't gotten a response so far, but the more people who complain (politely, and being sure to point out that you have both hands on the wheel and it can't detect that), the sooner they will do something about this.