Immersion 747 - Contrails looks like small broken Clouds

Hello , 

I use the 747 Immersion under P3Dv5 HF2 and i dont like the Style from the Contrails . 

The Contrails looks like small round clouds . Like Balls . But in real it is one line . 

I try already the different Settings in Immersion Manager . But without success . 

Here an original Picture : 


And here an Screenshot from Sim : 

Is there any Solution for this ? 

Thanks

Michael