So you are worried about the physical position of the needle, not the actual rich/leaness of the result? Word from here is don’t worry about it. As long as it is responding to adjustment, it should be fine. Wit motor warmed up and running at slow idle, turn the knob toward lean till it falters or sneezes (or quits), then back towards rich till it regains smooth running. Further turning toward rich should make it run rough. Proper setting is somewhere between sneezing and rich roughness. Feel free to tweak it a hair till you are satisfied. Then leave it alone.
BTW, the slow speed needle is just that–for slow speed. The fixed-jet orifice plug in the bottom is what controls the mixture at higher speeds.
Most will agree that a tad more oil for break-in of new pistons & rings is OK. Don’t go crazy with it though. 24:1 MAX.
