hey Carl.. probably a silly question, RE the needle valves...
I have not been able to find a good answer to the following about your engine .. the LOW speed needle valve:
the low speed can be either a proper needle valve (turn it IN to LEAN the mixture, turn OUT to richen)
OR it can be a bleed air valve: (turn it OUT <allowing more air into the mix> to LEAN the mixture, turn IN to richen)
do you know which type you've got?