Hi again, your target speed is above max operating ias. Does it work better if you fly at 320 kts for instance?
Does the LVL CHG mode work better?
PS : you should stick to one thread per problem, so that other users can see the whole process to find a solution.
Confirm you have the latest X-plane 11.05r1 update?
Confirm deleting output/preferences folder did not improve anything?
Can you attach your log.txt?