I suspect you'll get a bunch of opinions.
1. With throttle wide open, lean the high-speed needle a click at a time until max rpms (until engine starts to die), then richen the high-speed 4 or 5 clicks.
2. Reduce throttle to idle, let sit untouched for about 30 seconds. If during that time, the engine speeds up and dies, its lean so richen the low-speed. If it bogs down (slows), then its rich and you need to lean the low-speed.
Sounds like your low speed is too rich.