RE: low speed needle?
Too rich IMO, but I am no expert.
I recently richened mine up (3/4 of a turn CCW to almost flush) because it was too lean on the LSN (I was 1 full turn CW in from flush), which I could hear while letting off the accelerator or when taking off. It would sound like it was not getting fuel (cutting out).
It may be hard to tell between bogging out and cutting out.