Wrong. If you have a stumble at light throttle (Cruise mode) you have a lean condition. Look at you chart and go 1 stage Richer untill problem is cured.
Like I said before. Springs are for the POWER MODE.
Questions for you.
Have you checked your float level ?
Do you know your vacuum ?
What color spring do you have in there now ?
What metering rod do you have in there now ?
Which hole in the pump arm do you have it ?
You never told us Manual/electric choke ?
