UHHH..If you actually TUNE your engine before you fly it, what's the difference which way the needles have to be turned ????
Much ado about NOTHING.....LEARN TO TUNE YOUR ENGINE.
NO one can posibly predict what your carb settings willl be....NO book, NO amount of testing, will tell you to open or close your needles every time you fly....AT YOUR ALTITUDE, TEMPERATURE, HUMIDITY, AND PROP SIZE...There is NO chart to look at....
Sheesh, what a STUPID useless discussion....Except the CH part, we learned about that 65 years ago... Even before Pat was born...