RD400D low range carby stutter

At very low throttle opening, the carburation sounds totally confused, it’s as if I was using the kill button… rest of the range is very clean and crispy. There’s a lot of 20 mph (30km) zone in my zone and fines are VERY dissuasive! I need it to behave correctly at the openings. 
It also has a long history of bucking when shuting the throttle and letting the engine do the braking… 
I’ve tried adjusting the idle screw but it usually ends up with the bike having a hard time returning to the idle (stay at 2000 rpm for a while, unless you let the motor engaged & braking).

Again, advices and hints welcomed!

EDIT: Answer from Martin:
i think you need a larger pilot jet,struggling to return to idle is a symptom of lean jetting.

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