Advice need please on carb stting for a bgm177 kit

Hi I have recently worked on a vespa px125 with a bgm177 kit fitted,

standard crank

26mm si carb

160 air corrector

be3 atomiser

140 main jet

55/160 pilot jet

2 1/2 turns out on air mix

it has a polini ventury kit and a pinasco carb box lid

and an rz exhaust pipe fitted

timing was set to 19"

but it doesn't like to idle unless a fast idle is set,

any advice by people with a similar set up please



did you solved it?