for starters, welcome, however there is a car forum...

but...
sounds like the low needle is very close to where it needs to be but not exactly there yet..
Try letting it out in stages of 1/8th of a turn at a time.. maybe less... they are really sensetive so dont go doing 3 turns!

try maybe 4 times to get to 1/2 a turn.. each time give it time to see what the results are...

if it gets worse.. turn the other way..