I have had some success with moving the X axis points to work through "off idle" problems. Essentially clustering them them in problematic areas. That was when I was using a radio with only 7 point curve. With the Taranis and 12 points I have not had to move them on X. Then again, I've not had a chance to fly any of these conversions yet.

I've definitely noticed problems when running the lsn too too lean. After all, the solenoid can't deliver more fuel than what's available.To date, I have concentrated my efforts on needle adjustments that create a harmonious relationship with the solenoid i.e. where leaning or richening on the curve produces an equal resonse wrt to engine behaviour. It's really easy to get out of balance where the solenoid will over-lean the mixture with a small change on the curve but won't richen the mixture unless you raise the curve point a lot. So, I try to land the lsn and hsn where equal amounts of movement, up and down on the curve, results in reasonably equal changes in rpm.

I'm anxious to try richening the lsn more than usual to let the solenoid have more control. There may be some magic to be found there. Anything that can possibly make the curve more linear is worth a try in my book.

Edited to remove dumbazzness.