Hi John,your symptoms are common with Chinese carbs and it comes due to wrong LSN profile.Let me explain.
 The idling suction of engine is so great that you should put LSN into spray bar some farther to have a good idling and good transition.But that LSN now wouldnt allow spray bar to deliver enough fuel at WOT.Because at full open barrel LSN tip still partly restricts the spray bar so your HSN cant have full control the mixture at WOT because of that restriction.Easy to test.Open LSN some half turn and fly.I bet engine will not stop but you may have stop during low speed flying because of excessive rich idling and mid ranges.(extinguishing the glow plug while giving throttle).
The cure is to change LSN profile to have better restriction at low ranges/idling but fully allow spray bar at WOT.If your LSN has some taper then I recommend to cut up to 1 mm(you may have test cuts smaller that this) from the tip of LSN.This will give a better restriction at low speeds but full allow at WOT.