Rajeev,


The initial starting position is 2 mm out, but experience shows me that beginning 1.2 mm is better, since the final position ends up as .5-1.0 mm.

Check if the low-speed needle is not backing out of position (opening), from the engine's vibration.
If it does, make sure it doesn't...

Filing the ends of the spring flat and using some irrigation sealing Teflon tape, on the nozzle thread helps a lot.