1.5 L & 3 H sounds ball park.
The new eco carbs have finer needles to make them easier to tune & allow greater accuracy.
This is true if you the very expensive exhaust gas analysers but it makes it a bitch to do by ear because the difference between too rich & too lean can be 2 turns in place of 1/2 to 3/4 turns
So if you can get it up to full throttle , hold it there and turn the H needle out till it start to miss ( rich) then in till it starts to miss (Lean) then back to the mid point .
Note the difference in exhaust sounds while you are doing it .
Slowly back off and if it sounds like it is going to stall, turn the L needle in whichever direction makes it run fastest
Try to remember the sounds it made before when you adjusted the H needle , rich sounds soft & fluffly lean sounds sharp.
When you have it so you can back the throttle off till the chain stops then go back & readjust the H needle and then the L needle.
You may need to cycle through this a few times because the L is always supplying fuel where as the H should cut in at about 1/3 full revs.
You can do it the other way by starting with the L but usually it will stall out a dozen times so doing the H first I find easiest .
But you have not finished.
Final adjustments really need to be done "in the wood" so the saw is under load.
It is safest to have the engine a tiny bit rich than a little too lean
And light touch on the drivers.
The longer thinner needles are very easily damaged .