X-treme needle positions work! (carby related)

Hello guys!

I've been posting on Normans corner...but i dont want to abuse...and im sure you all have faced this scenario....

my bike has been working on the top slot of the needl ( a lot of oxigen) the thing accelerates ok, with not rattling and seems stable, but the iddle was too high and slows down to iddle with some delay....

so i started experimenting with other lower slots, and they didnt work well, but i got to the bottom one....and it works! im not sure why..my iddle is low, accel vibrates a bit, the bike doesn't like slow mph.....

all in between seems bad...but both extremes work! what do you guys do when this happens?

so noticed 2 things:

1. the intake tube is super cold and has hydrates on it (white stuff on the outside of the tube)

2. spoke to a veteran and he gave me a tip: "screw the iddle to the max and mark with liquid paper the place were the srew is set, that way you know how many turns youve released" i guess its something sooo basic i didn't think about...before i just set the screw on the moment..