those spray bars needs cleaning.
don't drill out the screw on the diaphram caps, use either a long gripper or try and get it in a vice and turn the carbs.
my left carb leaked at first , but it fills the right carb too and mine stopped after a bit and has been fine ever since. try 27mm as a compromise.
your still too lean!
3 turns out on pilot mix screw? BTW check that the pilot tip hasnt broken off in the carb, common on PO's who mess and tighten them up too much.